20988560

素因数分解:

$2^4\times 5^1\times {\mathrm{167}}^1\times {\mathrm{1571}}^1$

素因数の和:1751

約数の個数: 40

約数和(自身を含む): 49121856

約数和(自身を除く): 28133296

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 167, 334, 668, 835, 1336, 1571, 1670, 2672, 3142, 3340, 6284, 6680, 7855, 12568, 13360, 15710, 25136, 31420, 62840, 125680, 262357, 524714, 1049428, 1311785, 2098856, 2623570, 4197712, 5247140, 10494280, 20988560]

約数ペア:

[(1, 20988560), (2, 10494280), (4, 5247140), (5, 4197712), (8, 2623570), (10, 2098856), (16, 1311785), (20, 1049428), (40, 524714), (80, 262357), (167, 125680), (334, 62840), (668, 31420), (835, 25136), (1336, 15710), (1571, 13360), (1670, 12568), (2672, 7855), (3142, 6680), (3340, 6284)]