20781055

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{41}}^1\times {\mathrm{67}}^1\times {\mathrm{89}}^1$

素因数の和:219

約数の個数: 32

約数和(自身を含む): 27760320

約数和(自身を除く): 6979265

約数列:

[1, 5, 17, 41, 67, 85, 89, 205, 335, 445, 697, 1139, 1513, 2747, 3485, 3649, 5695, 5963, 7565, 13735, 18245, 29815, 46699, 62033, 101371, 233495, 244483, 310165, 506855, 1222415, 4156211, 20781055]

約数ペア:

[(1, 20781055), (5, 4156211), (17, 1222415), (41, 506855), (67, 310165), (85, 244483), (89, 233495), (205, 101371), (335, 62033), (445, 46699), (697, 29815), (1139, 18245), (1513, 13735), (2747, 7565), (3485, 5963), (3649, 5695)]