21123980

素因数分解:

$2^2\times 5^1\times {\mathrm{613}}^1\times {\mathrm{1723}}^1$

素因数の和:2345

約数の個数: 24

約数和(自身を含む): 44458512

約数和(自身を除く): 23334532

約数列:

[1, 2, 4, 5, 10, 20, 613, 1226, 1723, 2452, 3065, 3446, 6130, 6892, 8615, 12260, 17230, 34460, 1056199, 2112398, 4224796, 5280995, 10561990, 21123980]

約数ペア:

[(1, 21123980), (2, 10561990), (4, 5280995), (5, 4224796), (10, 2112398), (20, 1056199), (613, 34460), (1226, 17230), (1723, 12260), (2452, 8615), (3065, 6892), (3446, 6130)]