19952020

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{1019}}^1$

素因数の和:1128

約数の個数: 48

約数和(自身を含む): 46267200

約数和(自身を除く): 26315180

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 89, 110, 178, 220, 356, 445, 890, 979, 1019, 1780, 1958, 2038, 3916, 4076, 4895, 5095, 9790, 10190, 11209, 19580, 20380, 22418, 44836, 56045, 90691, 112090, 181382, 224180, 362764, 453455, 906910, 997601, 1813820, 1995202, 3990404, 4988005, 9976010, 19952020]

約数ペア:

[(1, 19952020), (2, 9976010), (4, 4988005), (5, 3990404), (10, 1995202), (11, 1813820), (20, 997601), (22, 906910), (44, 453455), (55, 362764), (89, 224180), (110, 181382), (178, 112090), (220, 90691), (356, 56045), (445, 44836), (890, 22418), (979, 20380), (1019, 19580), (1780, 11209), (1958, 10190), (2038, 9790), (3916, 5095), (4076, 4895)]