28520940

素因数分解:

$2^2\times 3^1\times 5^1\times 7^2\times {\mathrm{89}}^1\times {\mathrm{109}}^1$

素因数の和:224

約数の個数: 144

約数和(自身を含む): 94802400

約数和(自身を除く): 66281460

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 84, 89, 98, 105, 109, 140, 147, 178, 196, 210, 218, 245, 267, 294, 327, 356, 420, 436, 445, 490, 534, 545, 588, 623, 654, 735, 763, 890, 980, 1068, 1090, 1246, 1308, 1335, 1470, 1526, 1635, 1780, 1869, 2180, 2289, 2492, 2670, 2940, 3052, 3115, 3270, 3738, 3815, 4361, 4578, 5340, 5341, 6230, 6540, 7476, 7630, 8722, 9156, 9345, 9701, 10682, 11445, 12460, 13083, 15260, 16023, 17444, 18690, 19402, 21364, 21805, 22890, 26166, 26705, 29103, 32046, 37380, 38804, 43610, 45780, 48505, 52332, 53410, 58206, 64092, 65415, 67907, 80115, 87220, 97010, 106820, 116412, 130830, 135814, 145515, 160230, 194020, 203721, 261660, 271628, 291030, 320460, 339535, 407442, 475349, 582060, 679070, 814884, 950698, 1018605, 1358140, 1426047, 1901396, 2037210, 2376745, 2852094, 4074420, 4753490, 5704188, 7130235, 9506980, 14260470, 28520940]

約数ペア:

[(1, 28520940), (2, 14260470), (3, 9506980), (4, 7130235), (5, 5704188), (6, 4753490), (7, 4074420), (10, 2852094), (12, 2376745), (14, 2037210), (15, 1901396), (20, 1426047), (21, 1358140), (28, 1018605), (30, 950698), (35, 814884), (42, 679070), (49, 582060), (60, 475349), (70, 407442), (84, 339535), (89, 320460), (98, 291030), (105, 271628), (109, 261660), (140, 203721), (147, 194020), (178, 160230), (196, 145515), (210, 135814), (218, 130830), (245, 116412), (267, 106820), (294, 97010), (327, 87220), (356, 80115), (420, 67907), (436, 65415), (445, 64092), (490, 58206), (534, 53410), (545, 52332), (588, 48505), (623, 45780), (654, 43610), (735, 38804), (763, 37380), (890, 32046), (980, 29103), (1068, 26705), (1090, 26166), (1246, 22890), (1308, 21805), (1335, 21364), (1470, 19402), (1526, 18690), (1635, 17444), (1780, 16023), (1869, 15260), (2180, 13083), (2289, 12460), (2492, 11445), (2670, 10682), (2940, 9701), (3052, 9345), (3115, 9156), (3270, 8722), (3738, 7630), (3815, 7476), (4361, 6540), (4578, 6230), (5340, 5341)]