21578620

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{97}}^1\times {\mathrm{227}}^1$

素因数の和:347

約数の個数: 72

約数和(自身を含む): 53491536

約数和(自身を除く): 31912916

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 97, 98, 140, 194, 196, 227, 245, 388, 454, 485, 490, 679, 908, 970, 980, 1135, 1358, 1589, 1940, 2270, 2716, 3178, 3395, 4540, 4753, 6356, 6790, 7945, 9506, 11123, 13580, 15890, 19012, 22019, 22246, 23765, 31780, 44038, 44492, 47530, 55615, 88076, 95060, 110095, 111230, 154133, 220190, 222460, 308266, 440380, 616532, 770665, 1078931, 1541330, 2157862, 3082660, 4315724, 5394655, 10789310, 21578620]

約数ペア:

[(1, 21578620), (2, 10789310), (4, 5394655), (5, 4315724), (7, 3082660), (10, 2157862), (14, 1541330), (20, 1078931), (28, 770665), (35, 616532), (49, 440380), (70, 308266), (97, 222460), (98, 220190), (140, 154133), (194, 111230), (196, 110095), (227, 95060), (245, 88076), (388, 55615), (454, 47530), (485, 44492), (490, 44038), (679, 31780), (908, 23765), (970, 22246), (980, 22019), (1135, 19012), (1358, 15890), (1589, 13580), (1940, 11123), (2270, 9506), (2716, 7945), (3178, 6790), (3395, 6356), (4540, 4753)]