19998745

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{3457}}^1$

素因数の和:3564

約数の個数: 16

約数和(自身を含む): 26142480

約数和(自身を除く): 6143735

約数列:

[1, 5, 13, 65, 89, 445, 1157, 3457, 5785, 17285, 44941, 224705, 307673, 1538365, 3999749, 19998745]

約数ペア:

[(1, 19998745), (5, 3999749), (13, 1538365), (65, 307673), (89, 224705), (445, 44941), (1157, 17285), (3457, 5785)]