21243980

素因数分解:

$2^2\times 5^1\times {\mathrm{557}}^1\times {\mathrm{1907}}^1$

素因数の和:2473

約数の個数: 24

約数和(自身を含む): 44715888

約数和(自身を除く): 23471908

約数列:

[1, 2, 4, 5, 10, 20, 557, 1114, 1907, 2228, 2785, 3814, 5570, 7628, 9535, 11140, 19070, 38140, 1062199, 2124398, 4248796, 5310995, 10621990, 21243980]

約数ペア:

[(1, 21243980), (2, 10621990), (4, 5310995), (5, 4248796), (10, 2124398), (20, 1062199), (557, 38140), (1114, 19070), (1907, 11140), (2228, 9535), (2785, 7628), (3814, 5570)]