21901240

素因数分解:

$2^3\times 5^1\times {\mathrm{557}}^1\times {\mathrm{983}}^1$

素因数の和:1551

約数の個数: 32

約数和(自身を含む): 49416480

約数和(自身を除く): 27515240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 557, 983, 1114, 1966, 2228, 2785, 3932, 4456, 4915, 5570, 7864, 9830, 11140, 19660, 22280, 39320, 547531, 1095062, 2190124, 2737655, 4380248, 5475310, 10950620, 21901240]

約数ペア:

[(1, 21901240), (2, 10950620), (4, 5475310), (5, 4380248), (8, 2737655), (10, 2190124), (20, 1095062), (40, 547531), (557, 39320), (983, 22280), (1114, 19660), (1966, 11140), (2228, 9830), (2785, 7864), (3932, 5570), (4456, 4915)]