21514420

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1\times {\mathrm{139}}^1$

素因数の和:328

約数の個数: 48

約数和(自身を含む): 46569600

約数和(自身を除く): 25055180

約数列:

[1, 2, 4, 5, 10, 20, 71, 109, 139, 142, 218, 278, 284, 355, 436, 545, 556, 695, 710, 1090, 1390, 1420, 2180, 2780, 7739, 9869, 15151, 15478, 19738, 30302, 30956, 38695, 39476, 49345, 60604, 75755, 77390, 98690, 151510, 154780, 197380, 303020, 1075721, 2151442, 4302884, 5378605, 10757210, 21514420]

約数ペア:

[(1, 21514420), (2, 10757210), (4, 5378605), (5, 4302884), (10, 2151442), (20, 1075721), (71, 303020), (109, 197380), (139, 154780), (142, 151510), (218, 98690), (278, 77390), (284, 75755), (355, 60604), (436, 49345), (545, 39476), (556, 38695), (695, 30956), (710, 30302), (1090, 19738), (1390, 15478), (1420, 15151), (2180, 9869), (2780, 7739)]