20486960

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19699}}^1$

素因数の和:19725

約数の個数: 40

約数和(自身を含む): 51298800

約数和(自身を除く): 30811840

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19699, 39398, 78796, 98495, 157592, 196990, 256087, 315184, 393980, 512174, 787960, 1024348, 1280435, 1575920, 2048696, 2560870, 4097392, 5121740, 10243480, 20486960]

約数ペア:

[(1, 20486960), (2, 10243480), (4, 5121740), (5, 4097392), (8, 2560870), (10, 2048696), (13, 1575920), (16, 1280435), (20, 1024348), (26, 787960), (40, 512174), (52, 393980), (65, 315184), (80, 256087), (104, 196990), (130, 157592), (208, 98495), (260, 78796), (520, 39398), (1040, 19699)]