21392945

素因数分解:

$5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{19717}}^1$

素因数の和:19760

約数の個数: 16

約数和(自身を含む): 30286848

約数和(自身を除く): 8893903

約数列:

[1, 5, 7, 31, 35, 155, 217, 1085, 19717, 98585, 138019, 611227, 690095, 3056135, 4278589, 21392945]

約数ペア:

[(1, 21392945), (5, 4278589), (7, 3056135), (31, 690095), (35, 611227), (155, 138019), (217, 98585), (1085, 19717)]