20384560

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{409}}^1$

素因数の和:518

約数の個数: 80

約数和(自身を含む): 54907200

約数和(自身を除く): 34522640

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 89, 112, 140, 178, 280, 356, 409, 445, 560, 623, 712, 818, 890, 1246, 1424, 1636, 1780, 2045, 2492, 2863, 3115, 3272, 3560, 4090, 4984, 5726, 6230, 6544, 7120, 8180, 9968, 11452, 12460, 14315, 16360, 22904, 24920, 28630, 32720, 36401, 45808, 49840, 57260, 72802, 114520, 145604, 182005, 229040, 254807, 291208, 364010, 509614, 582416, 728020, 1019228, 1274035, 1456040, 2038456, 2548070, 2912080, 4076912, 5096140, 10192280, 20384560]

約数ペア:

[(1, 20384560), (2, 10192280), (4, 5096140), (5, 4076912), (7, 2912080), (8, 2548070), (10, 2038456), (14, 1456040), (16, 1274035), (20, 1019228), (28, 728020), (35, 582416), (40, 509614), (56, 364010), (70, 291208), (80, 254807), (89, 229040), (112, 182005), (140, 145604), (178, 114520), (280, 72802), (356, 57260), (409, 49840), (445, 45808), (560, 36401), (623, 32720), (712, 28630), (818, 24920), (890, 22904), (1246, 16360), (1424, 14315), (1636, 12460), (1780, 11452), (2045, 9968), (2492, 8180), (2863, 7120), (3115, 6544), (3272, 6230), (3560, 5726), (4090, 4984)]