20400580

素因数分解:

$2^2\times 5^1\times {\mathrm{73}}^1\times {\mathrm{89}}^1\times {\mathrm{157}}^1$

素因数の和:328

約数の個数: 48

約数和(自身を含む): 44195760

約数和(自身を除く): 23795180

約数列:

[1, 2, 4, 5, 10, 20, 73, 89, 146, 157, 178, 292, 314, 356, 365, 445, 628, 730, 785, 890, 1460, 1570, 1780, 3140, 6497, 11461, 12994, 13973, 22922, 25988, 27946, 32485, 45844, 55892, 57305, 64970, 69865, 114610, 129940, 139730, 229220, 279460, 1020029, 2040058, 4080116, 5100145, 10200290, 20400580]

約数ペア:

[(1, 20400580), (2, 10200290), (4, 5100145), (5, 4080116), (10, 2040058), (20, 1020029), (73, 279460), (89, 229220), (146, 139730), (157, 129940), (178, 114610), (292, 69865), (314, 64970), (356, 57305), (365, 55892), (445, 45844), (628, 32485), (730, 27946), (785, 25988), (890, 22922), (1460, 13973), (1570, 12994), (1780, 11461), (3140, 6497)]