20018980

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^2\times {\mathrm{269}}^1$

素因数の和:400

約数の個数: 36

約数和(自身を含む): 42899220

約数和(自身を除く): 22880240

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 269, 305, 538, 610, 1076, 1220, 1345, 2690, 3721, 5380, 7442, 14884, 16409, 18605, 32818, 37210, 65636, 74420, 82045, 164090, 328180, 1000949, 2001898, 4003796, 5004745, 10009490, 20018980]

約数ペア:

[(1, 20018980), (2, 10009490), (4, 5004745), (5, 4003796), (10, 2001898), (20, 1000949), (61, 328180), (122, 164090), (244, 82045), (269, 74420), (305, 65636), (538, 37210), (610, 32818), (1076, 18605), (1220, 16409), (1345, 14884), (2690, 7442), (3721, 5380)]