21001240

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{40387}}^1$

素因数の和:40411

約数の個数: 32

約数和(自身を含む): 50888880

約数和(自身を除く): 29887640

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 40387, 80774, 161548, 201935, 323096, 403870, 525031, 807740, 1050062, 1615480, 2100124, 2625155, 4200248, 5250310, 10500620, 21001240]

約数ペア:

[(1, 21001240), (2, 10500620), (4, 5250310), (5, 4200248), (8, 2625155), (10, 2100124), (13, 1615480), (20, 1050062), (26, 807740), (40, 525031), (52, 403870), (65, 323096), (104, 201935), (130, 161548), (260, 80774), (520, 40387)]