20478380

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{997}}^1$

素因数の和:1098

約数の個数: 48

約数和(自身を含む): 46945920

約数和(自身を除く): 26467540

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 79, 130, 158, 260, 316, 395, 790, 997, 1027, 1580, 1994, 2054, 3988, 4108, 4985, 5135, 9970, 10270, 12961, 19940, 20540, 25922, 51844, 64805, 78763, 129610, 157526, 259220, 315052, 393815, 787630, 1023919, 1575260, 2047838, 4095676, 5119595, 10239190, 20478380]

約数ペア:

[(1, 20478380), (2, 10239190), (4, 5119595), (5, 4095676), (10, 2047838), (13, 1575260), (20, 1023919), (26, 787630), (52, 393815), (65, 315052), (79, 259220), (130, 157526), (158, 129610), (260, 78763), (316, 64805), (395, 51844), (790, 25922), (997, 20540), (1027, 19940), (1580, 12961), (1994, 10270), (2054, 9970), (3988, 5135), (4108, 4985)]