21017690

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{151}}^1\times {\mathrm{449}}^1$

素因数の和:638

約数の個数: 32

約数和(自身を含む): 39398400

約数和(自身を除く): 18380710

約数列:

[1, 2, 5, 10, 31, 62, 151, 155, 302, 310, 449, 755, 898, 1510, 2245, 4490, 4681, 9362, 13919, 23405, 27838, 46810, 67799, 69595, 135598, 139190, 338995, 677990, 2101769, 4203538, 10508845, 21017690]

約数ペア:

[(1, 21017690), (2, 10508845), (5, 4203538), (10, 2101769), (31, 677990), (62, 338995), (151, 139190), (155, 135598), (302, 69595), (310, 67799), (449, 46810), (755, 27838), (898, 23405), (1510, 13919), (2245, 9362), (4490, 4681)]