21008180

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^2\times {\mathrm{1249}}^1$

素因数の和:1316

約数の個数: 36

約数和(自身を含む): 45727500

約数和(自身を除く): 24719320

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 145, 290, 580, 841, 1249, 1682, 2498, 3364, 4205, 4996, 6245, 8410, 12490, 16820, 24980, 36221, 72442, 144884, 181105, 362210, 724420, 1050409, 2100818, 4201636, 5252045, 10504090, 21008180]

約数ペア:

[(1, 21008180), (2, 10504090), (4, 5252045), (5, 4201636), (10, 2100818), (20, 1050409), (29, 724420), (58, 362210), (116, 181105), (145, 144884), (290, 72442), (580, 36221), (841, 24980), (1249, 16820), (1682, 12490), (2498, 8410), (3364, 6245), (4205, 4996)]