21148840

素因数分解:

$2^3\times 5^1\times {\mathrm{271}}^1\times {\mathrm{1951}}^1$

素因数の和:2233

約数の個数: 32

約数和(自身を含む): 47784960

約数和(自身を除く): 26636120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 271, 542, 1084, 1355, 1951, 2168, 2710, 3902, 5420, 7804, 9755, 10840, 15608, 19510, 39020, 78040, 528721, 1057442, 2114884, 2643605, 4229768, 5287210, 10574420, 21148840]

約数ペア:

[(1, 21148840), (2, 10574420), (4, 5287210), (5, 4229768), (8, 2643605), (10, 2114884), (20, 1057442), (40, 528721), (271, 78040), (542, 39020), (1084, 19510), (1355, 15608), (1951, 10840), (2168, 9755), (2710, 7804), (3902, 5420)]