21091990

素因数分解:

$2^1\times 5^1\times {\mathrm{29}}^1\times {\mathrm{257}}^1\times {\mathrm{283}}^1$

素因数の和:576

約数の個数: 32

約数和(自身を含む): 39566880

約数和(自身を除く): 18474890

約数列:

[1, 2, 5, 10, 29, 58, 145, 257, 283, 290, 514, 566, 1285, 1415, 2570, 2830, 7453, 8207, 14906, 16414, 37265, 41035, 72731, 74530, 82070, 145462, 363655, 727310, 2109199, 4218398, 10545995, 21091990]

約数ペア:

[(1, 21091990), (2, 10545995), (5, 4218398), (10, 2109199), (29, 727310), (58, 363655), (145, 145462), (257, 82070), (283, 74530), (290, 72731), (514, 41035), (566, 37265), (1285, 16414), (1415, 14906), (2570, 8207), (2830, 7453)]