21816920

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{53}}^1\times {\mathrm{251}}^1$

素因数の和:356

約数の個数: 64

約数和(自身を含む): 51438240

約数和(自身を除く): 29621320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 53, 82, 106, 164, 205, 212, 251, 265, 328, 410, 424, 502, 530, 820, 1004, 1060, 1255, 1640, 2008, 2120, 2173, 2510, 4346, 5020, 8692, 10040, 10291, 10865, 13303, 17384, 20582, 21730, 26606, 41164, 43460, 51455, 53212, 66515, 82328, 86920, 102910, 106424, 133030, 205820, 266060, 411640, 532120, 545423, 1090846, 2181692, 2727115, 4363384, 5454230, 10908460, 21816920]

約数ペア:

[(1, 21816920), (2, 10908460), (4, 5454230), (5, 4363384), (8, 2727115), (10, 2181692), (20, 1090846), (40, 545423), (41, 532120), (53, 411640), (82, 266060), (106, 205820), (164, 133030), (205, 106424), (212, 102910), (251, 86920), (265, 82328), (328, 66515), (410, 53212), (424, 51455), (502, 43460), (530, 41164), (820, 26606), (1004, 21730), (1060, 20582), (1255, 17384), (1640, 13303), (2008, 10865), (2120, 10291), (2173, 10040), (2510, 8692), (4346, 5020)]