20681960

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{1283}}^1$

素因数の和:1338

約数の個数: 64

約数和(自身を含む): 51770880

約数和(自身を除く): 31088920

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 31, 40, 52, 62, 65, 104, 124, 130, 155, 248, 260, 310, 403, 520, 620, 806, 1240, 1283, 1612, 2015, 2566, 3224, 4030, 5132, 6415, 8060, 10264, 12830, 16120, 16679, 25660, 33358, 39773, 51320, 66716, 79546, 83395, 133432, 159092, 166790, 198865, 318184, 333580, 397730, 517049, 667160, 795460, 1034098, 1590920, 2068196, 2585245, 4136392, 5170490, 10340980, 20681960]

約数ペア:

[(1, 20681960), (2, 10340980), (4, 5170490), (5, 4136392), (8, 2585245), (10, 2068196), (13, 1590920), (20, 1034098), (26, 795460), (31, 667160), (40, 517049), (52, 397730), (62, 333580), (65, 318184), (104, 198865), (124, 166790), (130, 159092), (155, 133432), (248, 83395), (260, 79546), (310, 66716), (403, 51320), (520, 39773), (620, 33358), (806, 25660), (1240, 16679), (1283, 16120), (1612, 12830), (2015, 10264), (2566, 8060), (3224, 6415), (4030, 5132)]