20485840

素因数分解:

$2^4\times 5^1\times {\mathrm{163}}^1\times {\mathrm{1571}}^1$

素因数の和:1747

約数の個数: 40

約数和(自身を含む): 47952288

約数和(自身を除く): 27466448

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 163, 326, 652, 815, 1304, 1571, 1630, 2608, 3142, 3260, 6284, 6520, 7855, 12568, 13040, 15710, 25136, 31420, 62840, 125680, 256073, 512146, 1024292, 1280365, 2048584, 2560730, 4097168, 5121460, 10242920, 20485840]

約数ペア:

[(1, 20485840), (2, 10242920), (4, 5121460), (5, 4097168), (8, 2560730), (10, 2048584), (16, 1280365), (20, 1024292), (40, 512146), (80, 256073), (163, 125680), (326, 62840), (652, 31420), (815, 25136), (1304, 15710), (1571, 13040), (1630, 12568), (2608, 7855), (3142, 6520), (3260, 6284)]