21326920

素因数分解:

$2^3\times 5^1\times {\mathrm{163}}^1\times {\mathrm{3271}}^1$

素因数の和:3445

約数の個数: 32

約数和(自身を含む): 48294720

約数和(自身を除く): 26967800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 163, 326, 652, 815, 1304, 1630, 3260, 3271, 6520, 6542, 13084, 16355, 26168, 32710, 65420, 130840, 533173, 1066346, 2132692, 2665865, 4265384, 5331730, 10663460, 21326920]

約数ペア:

[(1, 21326920), (2, 10663460), (4, 5331730), (5, 4265384), (8, 2665865), (10, 2132692), (20, 1066346), (40, 533173), (163, 130840), (326, 65420), (652, 32710), (815, 26168), (1304, 16355), (1630, 13084), (3260, 6542), (3271, 6520)]