21900505

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{397}}^1$

素因数の和:489

約数の個数: 32

約数和(自身を含む): 30948480

約数和(自身を除く): 9047975

約数列:

[1, 5, 11, 17, 55, 59, 85, 187, 295, 397, 649, 935, 1003, 1985, 3245, 4367, 5015, 6749, 11033, 21835, 23423, 33745, 55165, 74239, 117115, 257653, 371195, 398191, 1288265, 1990955, 4380101, 21900505]

約数ペア:

[(1, 21900505), (5, 4380101), (11, 1990955), (17, 1288265), (55, 398191), (59, 371195), (85, 257653), (187, 117115), (295, 74239), (397, 55165), (649, 33745), (935, 23423), (1003, 21835), (1985, 11033), (3245, 6749), (4367, 5015)]