21513380

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{4957}}^1$

素因数の和:5004

約数の個数: 48

約数和(自身を含む): 53308416

約数和(自身を除く): 31795036

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 868, 1085, 2170, 4340, 4957, 9914, 19828, 24785, 34699, 49570, 69398, 99140, 138796, 153667, 173495, 307334, 346990, 614668, 693980, 768335, 1075669, 1536670, 2151338, 3073340, 4302676, 5378345, 10756690, 21513380]

約数ペア:

[(1, 21513380), (2, 10756690), (4, 5378345), (5, 4302676), (7, 3073340), (10, 2151338), (14, 1536670), (20, 1075669), (28, 768335), (31, 693980), (35, 614668), (62, 346990), (70, 307334), (124, 173495), (140, 153667), (155, 138796), (217, 99140), (310, 69398), (434, 49570), (620, 34699), (868, 24785), (1085, 19828), (2170, 9914), (4340, 4957)]