21777880

素因数分解:

$2^3\times 5^1\times {\mathrm{443}}^1\times {\mathrm{1229}}^1$

素因数の和:1683

約数の個数: 32

約数和(自身を含む): 49150800

約数和(自身を除く): 27372920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 443, 886, 1229, 1772, 2215, 2458, 3544, 4430, 4916, 6145, 8860, 9832, 12290, 17720, 24580, 49160, 544447, 1088894, 2177788, 2722235, 4355576, 5444470, 10888940, 21777880]

約数ペア:

[(1, 21777880), (2, 10888940), (4, 5444470), (5, 4355576), (8, 2722235), (10, 2177788), (20, 1088894), (40, 544447), (443, 49160), (886, 24580), (1229, 17720), (1772, 12290), (2215, 9832), (2458, 8860), (3544, 6145), (4430, 4916)]