21606340

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{983}}^1$

素因数の和:1156

約数の個数: 48

約数和(自身を含む): 52238592

約数和(自身を除く): 30632252

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 157, 314, 628, 785, 983, 1099, 1570, 1966, 2198, 3140, 3932, 4396, 4915, 5495, 6881, 9830, 10990, 13762, 19660, 21980, 27524, 34405, 68810, 137620, 154331, 308662, 617324, 771655, 1080317, 1543310, 2160634, 3086620, 4321268, 5401585, 10803170, 21606340]

約数ペア:

[(1, 21606340), (2, 10803170), (4, 5401585), (5, 4321268), (7, 3086620), (10, 2160634), (14, 1543310), (20, 1080317), (28, 771655), (35, 617324), (70, 308662), (140, 154331), (157, 137620), (314, 68810), (628, 34405), (785, 27524), (983, 21980), (1099, 19660), (1570, 13762), (1966, 10990), (2198, 9830), (3140, 6881), (3932, 5495), (4396, 4915)]