21052197640

素因数分解:

$2^3\times 5^1\times {\mathrm{389}}^1\times {\mathrm{1352969}}^1$

素因数の和:1353369

約数の個数: 32

約数和(自身を含む): 47489247000

約数和(自身を除く): 26437049360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 389, 778, 1556, 1945, 3112, 3890, 7780, 15560, 1352969, 2705938, 5411876, 6764845, 10823752, 13529690, 27059380, 54118760, 526304941, 1052609882, 2105219764, 2631524705, 4210439528, 5263049410, 10526098820, 21052197640]

約数ペア:

[(1, 21052197640), (2, 10526098820), (4, 5263049410), (5, 4210439528), (8, 2631524705), (10, 2105219764), (20, 1052609882), (40, 526304941), (389, 54118760), (778, 27059380), (1556, 13529690), (1945, 10823752), (3112, 6764845), (3890, 5411876), (7780, 2705938), (15560, 1352969)]