21249915

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{167}}^1\times {\mathrm{499}}^1$

素因数の和:691

約数の個数: 32

約数和(自身を含む): 36288000

約数和(自身を除く): 15038085

約数列:

[1, 3, 5, 15, 17, 51, 85, 167, 255, 499, 501, 835, 1497, 2495, 2505, 2839, 7485, 8483, 8517, 14195, 25449, 42415, 42585, 83333, 127245, 249999, 416665, 1249995, 1416661, 4249983, 7083305, 21249915]

約数ペア:

[(1, 21249915), (3, 7083305), (5, 4249983), (15, 1416661), (17, 1249995), (51, 416665), (85, 249999), (167, 127245), (255, 83333), (499, 42585), (501, 42415), (835, 25449), (1497, 14195), (2495, 8517), (2505, 8483), (2839, 7485)]