21797240

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{13291}}^1$

素因数の和:13343

約数の個数: 32

約数和(自身を含む): 50243760

約数和(自身を除く): 28446520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 13291, 26582, 53164, 66455, 106328, 132910, 265820, 531640, 544931, 1089862, 2179724, 2724655, 4359448, 5449310, 10898620, 21797240]

約数ペア:

[(1, 21797240), (2, 10898620), (4, 5449310), (5, 4359448), (8, 2724655), (10, 2179724), (20, 1089862), (40, 544931), (41, 531640), (82, 265820), (164, 132910), (205, 106328), (328, 66455), (410, 53164), (820, 26582), (1640, 13291)]