21031245

素因数分解:

$3^4\times 5^1\times {\mathrm{51929}}^1$

素因数の和:51946

約数の個数: 20

約数和(自身を含む): 37701180

約数和(自身を除く): 16669935

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 51929, 155787, 259645, 467361, 778935, 1402083, 2336805, 4206249, 7010415, 21031245]

約数ペア:

[(1, 21031245), (3, 7010415), (5, 4206249), (9, 2336805), (15, 1402083), (27, 778935), (45, 467361), (81, 259645), (135, 155787), (405, 51929)]