21303640

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8731}}^1$

素因数の和:8803

約数の個数: 32

約数和(自身を含む): 48724560

約数和(自身を除く): 27420920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8731, 17462, 34924, 43655, 69848, 87310, 174620, 349240, 532591, 1065182, 2130364, 2662955, 4260728, 5325910, 10651820, 21303640]

約数ペア:

[(1, 21303640), (2, 10651820), (4, 5325910), (5, 4260728), (8, 2662955), (10, 2130364), (20, 1065182), (40, 532591), (61, 349240), (122, 174620), (244, 87310), (305, 69848), (488, 43655), (610, 34924), (1220, 17462), (2440, 8731)]