21521990

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{2347}}^1$

素因数の和:2492

約数の個数: 32

約数和(自身を含む): 44630784

約数和(自身を除く): 23108794

約数列:

[1, 2, 5, 7, 10, 14, 35, 70, 131, 262, 655, 917, 1310, 1834, 2347, 4585, 4694, 9170, 11735, 16429, 23470, 32858, 82145, 164290, 307457, 614914, 1537285, 2152199, 3074570, 4304398, 10760995, 21521990]

約数ペア:

[(1, 21521990), (2, 10760995), (5, 4304398), (7, 3074570), (10, 2152199), (14, 1537285), (35, 614914), (70, 307457), (131, 164290), (262, 82145), (655, 32858), (917, 23470), (1310, 16429), (1834, 11735), (2347, 9170), (4585, 4694)]