21418747

素因数分解:

$7^1\times {\mathrm{61}}^1\times {\mathrm{103}}^1\times {\mathrm{487}}^1$

素因数の和:658

約数の個数: 16

約数和(自身を含む): 25172992

約数和(自身を除く): 3754245

約数列:

[1, 7, 61, 103, 427, 487, 721, 3409, 6283, 29707, 43981, 50161, 207949, 351127, 3059821, 21418747]

約数ペア:

[(1, 21418747), (7, 3059821), (61, 351127), (103, 207949), (427, 50161), (487, 43981), (721, 29707), (3409, 6283)]