21688245

素因数分解:

$3^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{7901}}^1$

素因数の和:7973

約数の個数: 24

約数和(自身を含む): 38214072

約数和(自身を除く): 16525827

約数列:

[1, 3, 5, 9, 15, 45, 61, 183, 305, 549, 915, 2745, 7901, 23703, 39505, 71109, 118515, 355545, 481961, 1445883, 2409805, 4337649, 7229415, 21688245]

約数ペア:

[(1, 21688245), (3, 7229415), (5, 4337649), (9, 2409805), (15, 1445883), (45, 481961), (61, 355545), (183, 118515), (305, 71109), (549, 39505), (915, 23703), (2745, 7901)]