21378890

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{3499}}^1$

素因数の和:3566

約数の個数: 32

約数和(自身を含む): 42336000

約数和(自身を除く): 20957110

約数列:

[1, 2, 5, 10, 13, 26, 47, 65, 94, 130, 235, 470, 611, 1222, 3055, 3499, 6110, 6998, 17495, 34990, 45487, 90974, 164453, 227435, 328906, 454870, 822265, 1644530, 2137889, 4275778, 10689445, 21378890]

約数ペア:

[(1, 21378890), (2, 10689445), (5, 4275778), (10, 2137889), (13, 1644530), (26, 822265), (47, 454870), (65, 328906), (94, 227435), (130, 164453), (235, 90974), (470, 45487), (611, 34990), (1222, 17495), (3055, 6998), (3499, 6110)]