21325880

素因数分解:

$2^3\times 5^1\times {\mathrm{431}}^1\times {\mathrm{1237}}^1$

素因数の和:1679

約数の個数: 32

約数和(自身を含む): 48133440

約数和(自身を除く): 26807560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 431, 862, 1237, 1724, 2155, 2474, 3448, 4310, 4948, 6185, 8620, 9896, 12370, 17240, 24740, 49480, 533147, 1066294, 2132588, 2665735, 4265176, 5331470, 10662940, 21325880]

約数ペア:

[(1, 21325880), (2, 10662940), (4, 5331470), (5, 4265176), (8, 2665735), (10, 2132588), (20, 1066294), (40, 533147), (431, 49480), (862, 24740), (1237, 17240), (1724, 12370), (2155, 9896), (2474, 8620), (3448, 6185), (4310, 4948)]