20991015

素因数分解:

$3^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{2549}}^1$

素因数の和:2624

約数の個数: 32

約数和(自身を含む): 37944000

約数和(自身を除く): 16952985

約数列:

[1, 3, 5, 9, 15, 27, 45, 61, 135, 183, 305, 549, 915, 1647, 2549, 2745, 7647, 8235, 12745, 22941, 38235, 68823, 114705, 155489, 344115, 466467, 777445, 1399401, 2332335, 4198203, 6997005, 20991015]

約数ペア:

[(1, 20991015), (3, 6997005), (5, 4198203), (9, 2332335), (15, 1399401), (27, 777445), (45, 466467), (61, 344115), (135, 155489), (183, 114705), (305, 68823), (549, 38235), (915, 22941), (1647, 12745), (2549, 8235), (2745, 7647)]