20840990

素因数分解:

$2^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{79}}^1$

素因数の和:177

約数の個数: 64

約数和(自身を含む): 42024960

約数和(自身を除く): 21183970

約数列:

[1, 2, 5, 10, 23, 31, 37, 46, 62, 74, 79, 115, 155, 158, 185, 230, 310, 370, 395, 713, 790, 851, 1147, 1426, 1702, 1817, 2294, 2449, 2923, 3565, 3634, 4255, 4898, 5735, 5846, 7130, 8510, 9085, 11470, 12245, 14615, 18170, 24490, 26381, 29230, 52762, 56327, 67229, 90613, 112654, 131905, 134458, 181226, 263810, 281635, 336145, 453065, 563270, 672290, 906130, 2084099, 4168198, 10420495, 20840990]

約数ペア:

[(1, 20840990), (2, 10420495), (5, 4168198), (10, 2084099), (23, 906130), (31, 672290), (37, 563270), (46, 453065), (62, 336145), (74, 281635), (79, 263810), (115, 181226), (155, 134458), (158, 131905), (185, 112654), (230, 90613), (310, 67229), (370, 56327), (395, 52762), (713, 29230), (790, 26381), (851, 24490), (1147, 18170), (1426, 14615), (1702, 12245), (1817, 11470), (2294, 9085), (2449, 8510), (2923, 7130), (3565, 5846), (3634, 5735), (4255, 4898)]