20831980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{4217}}^1$

素因数の和:4258

約数の個数: 48

約数和(自身を含む): 49603680

約数和(自身を除く): 28771700

約数列:

[1, 2, 4, 5, 10, 13, 19, 20, 26, 38, 52, 65, 76, 95, 130, 190, 247, 260, 380, 494, 988, 1235, 2470, 4217, 4940, 8434, 16868, 21085, 42170, 54821, 80123, 84340, 109642, 160246, 219284, 274105, 320492, 400615, 548210, 801230, 1041599, 1096420, 1602460, 2083198, 4166396, 5207995, 10415990, 20831980]

約数ペア:

[(1, 20831980), (2, 10415990), (4, 5207995), (5, 4166396), (10, 2083198), (13, 1602460), (19, 1096420), (20, 1041599), (26, 801230), (38, 548210), (52, 400615), (65, 320492), (76, 274105), (95, 219284), (130, 160246), (190, 109642), (247, 84340), (260, 80123), (380, 54821), (494, 42170), (988, 21085), (1235, 16868), (2470, 8434), (4217, 4940)]