21639400

素因数分解:

$2^3\times 5^2\times {\mathrm{257}}^1\times {\mathrm{421}}^1$

素因数の和:694

約数の個数: 48

約数和(自身を含む): 50627340

約数和(自身を除く): 28987940

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 257, 421, 514, 842, 1028, 1285, 1684, 2056, 2105, 2570, 3368, 4210, 5140, 6425, 8420, 10280, 10525, 12850, 16840, 21050, 25700, 42100, 51400, 84200, 108197, 216394, 432788, 540985, 865576, 1081970, 2163940, 2704925, 4327880, 5409850, 10819700, 21639400]

約数ペア:

[(1, 21639400), (2, 10819700), (4, 5409850), (5, 4327880), (8, 2704925), (10, 2163940), (20, 1081970), (25, 865576), (40, 540985), (50, 432788), (100, 216394), (200, 108197), (257, 84200), (421, 51400), (514, 42100), (842, 25700), (1028, 21050), (1285, 16840), (1684, 12850), (2056, 10525), (2105, 10280), (2570, 8420), (3368, 6425), (4210, 5140)]