21652880

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8731}}^1$

素因数の和:8775

約数の個数: 40

約数和(自身を含む): 51972864

約数和(自身を除く): 30319984

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8731, 17462, 34924, 43655, 69848, 87310, 139696, 174620, 270661, 349240, 541322, 698480, 1082644, 1353305, 2165288, 2706610, 4330576, 5413220, 10826440, 21652880]

約数ペア:

[(1, 21652880), (2, 10826440), (4, 5413220), (5, 4330576), (8, 2706610), (10, 2165288), (16, 1353305), (20, 1082644), (31, 698480), (40, 541322), (62, 349240), (80, 270661), (124, 174620), (155, 139696), (248, 87310), (310, 69848), (496, 43655), (620, 34924), (1240, 17462), (2480, 8731)]