21128840

素因数分解:

$2^3\times 5^1\times {\mathrm{167}}^1\times {\mathrm{3163}}^1$

素因数の和:3341

約数の個数: 32

約数和(自身を含む): 47839680

約数和(自身を除く): 26710840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 167, 334, 668, 835, 1336, 1670, 3163, 3340, 6326, 6680, 12652, 15815, 25304, 31630, 63260, 126520, 528221, 1056442, 2112884, 2641105, 4225768, 5282210, 10564420, 21128840]

約数ペア:

[(1, 21128840), (2, 10564420), (4, 5282210), (5, 4225768), (8, 2641105), (10, 2112884), (20, 1056442), (40, 528221), (167, 126520), (334, 63260), (668, 31630), (835, 25304), (1336, 15815), (1670, 12652), (3163, 6680), (3340, 6326)]