20408480

素因数分解:

$2^5\times 5^1\times {\mathrm{229}}^1\times {\mathrm{557}}^1$

素因数の和:801

約数の個数: 48

約数和(自身を含む): 48512520

約数和(自身を除く): 28104040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 229, 458, 557, 916, 1114, 1145, 1832, 2228, 2290, 2785, 3664, 4456, 4580, 5570, 7328, 8912, 9160, 11140, 17824, 18320, 22280, 36640, 44560, 89120, 127553, 255106, 510212, 637765, 1020424, 1275530, 2040848, 2551060, 4081696, 5102120, 10204240, 20408480]

約数ペア:

[(1, 20408480), (2, 10204240), (4, 5102120), (5, 4081696), (8, 2551060), (10, 2040848), (16, 1275530), (20, 1020424), (32, 637765), (40, 510212), (80, 255106), (160, 127553), (229, 89120), (458, 44560), (557, 36640), (916, 22280), (1114, 18320), (1145, 17824), (1832, 11140), (2228, 9160), (2290, 8912), (2785, 7328), (3664, 5570), (4456, 4580)]