21520575

素因数分解:

$3^2\times 5^2\times {\mathrm{101}}^1\times {\mathrm{947}}^1$

素因数の和:1064

約数の個数: 36

約数和(自身を含む): 38968488

約数和(自身を除く): 17447913

約数列:

[1, 3, 5, 9, 15, 25, 45, 75, 101, 225, 303, 505, 909, 947, 1515, 2525, 2841, 4545, 4735, 7575, 8523, 14205, 22725, 23675, 42615, 71025, 95647, 213075, 286941, 478235, 860823, 1434705, 2391175, 4304115, 7173525, 21520575]

約数ペア:

[(1, 21520575), (3, 7173525), (5, 4304115), (9, 2391175), (15, 1434705), (25, 860823), (45, 478235), (75, 286941), (101, 213075), (225, 95647), (303, 71025), (505, 42615), (909, 23675), (947, 22725), (1515, 14205), (2525, 8523), (2841, 7575), (4545, 4735)]