21613221

素因数分解:

$3^2\times 7^1\times {\mathrm{349}}^1\times {\mathrm{983}}^1$

素因数の和:1345

約数の個数: 24

約数和(自身を含む): 35817600

約数和(自身を除く): 14204379

約数列:

[1, 3, 7, 9, 21, 63, 349, 983, 1047, 2443, 2949, 3141, 6881, 7329, 8847, 20643, 21987, 61929, 343067, 1029201, 2401469, 3087603, 7204407, 21613221]

約数ペア:

[(1, 21613221), (3, 7204407), (7, 3087603), (9, 2401469), (21, 1029201), (63, 343067), (349, 61929), (983, 21987), (1047, 20643), (2443, 8847), (2949, 7329), (3141, 6881)]