20449520

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{53}}^2$

素因数の和:139

約数の個数: 120

約数和(自身を含む): 59642016

約数和(自身を除く): 39192496

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 35, 40, 52, 53, 56, 65, 70, 80, 91, 104, 106, 112, 130, 140, 182, 208, 212, 260, 265, 280, 364, 371, 424, 455, 520, 530, 560, 689, 728, 742, 848, 910, 1040, 1060, 1378, 1456, 1484, 1820, 1855, 2120, 2756, 2809, 2968, 3445, 3640, 3710, 4240, 4823, 5512, 5618, 5936, 6890, 7280, 7420, 9646, 11024, 11236, 13780, 14045, 14840, 19292, 19663, 22472, 24115, 27560, 28090, 29680, 36517, 38584, 39326, 44944, 48230, 55120, 56180, 73034, 77168, 78652, 96460, 98315, 112360, 146068, 157304, 182585, 192920, 196630, 224720, 255619, 292136, 314608, 365170, 385840, 393260, 511238, 584272, 730340, 786520, 1022476, 1278095, 1460680, 1573040, 2044952, 2556190, 2921360, 4089904, 5112380, 10224760, 20449520]

約数ペア:

[(1, 20449520), (2, 10224760), (4, 5112380), (5, 4089904), (7, 2921360), (8, 2556190), (10, 2044952), (13, 1573040), (14, 1460680), (16, 1278095), (20, 1022476), (26, 786520), (28, 730340), (35, 584272), (40, 511238), (52, 393260), (53, 385840), (56, 365170), (65, 314608), (70, 292136), (80, 255619), (91, 224720), (104, 196630), (106, 192920), (112, 182585), (130, 157304), (140, 146068), (182, 112360), (208, 98315), (212, 96460), (260, 78652), (265, 77168), (280, 73034), (364, 56180), (371, 55120), (424, 48230), (455, 44944), (520, 39326), (530, 38584), (560, 36517), (689, 29680), (728, 28090), (742, 27560), (848, 24115), (910, 22472), (1040, 19663), (1060, 19292), (1378, 14840), (1456, 14045), (1484, 13780), (1820, 11236), (1855, 11024), (2120, 9646), (2756, 7420), (2809, 7280), (2968, 6890), (3445, 5936), (3640, 5618), (3710, 5512), (4240, 4823)]