21998840

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{113}}^1\times {\mathrm{157}}^1$

素因数の和:312

約数の個数: 64

約数和(自身を含む): 51874560

約数和(自身を除く): 29875720

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 113, 124, 155, 157, 226, 248, 310, 314, 452, 565, 620, 628, 785, 904, 1130, 1240, 1256, 1570, 2260, 3140, 3503, 4520, 4867, 6280, 7006, 9734, 14012, 17515, 17741, 19468, 24335, 28024, 35030, 35482, 38936, 48670, 70060, 70964, 88705, 97340, 140120, 141928, 177410, 194680, 354820, 549971, 709640, 1099942, 2199884, 2749855, 4399768, 5499710, 10999420, 21998840]

約数ペア:

[(1, 21998840), (2, 10999420), (4, 5499710), (5, 4399768), (8, 2749855), (10, 2199884), (20, 1099942), (31, 709640), (40, 549971), (62, 354820), (113, 194680), (124, 177410), (155, 141928), (157, 140120), (226, 97340), (248, 88705), (310, 70964), (314, 70060), (452, 48670), (565, 38936), (620, 35482), (628, 35030), (785, 28024), (904, 24335), (1130, 19468), (1240, 17741), (1256, 17515), (1570, 14012), (2260, 9734), (3140, 7006), (3503, 6280), (4520, 4867)]