20868975

素因数分解:

$3^3\times 5^2\times {\mathrm{43}}^1\times {\mathrm{719}}^1$

素因数の和:781

約数の個数: 48

約数和(自身を含む): 39283200

約数和(自身を除く): 18414225

約数列:

[1, 3, 5, 9, 15, 25, 27, 43, 45, 75, 129, 135, 215, 225, 387, 645, 675, 719, 1075, 1161, 1935, 2157, 3225, 3595, 5805, 6471, 9675, 10785, 17975, 19413, 29025, 30917, 32355, 53925, 92751, 97065, 154585, 161775, 278253, 463755, 485325, 772925, 834759, 1391265, 2318775, 4173795, 6956325, 20868975]

約数ペア:

[(1, 20868975), (3, 6956325), (5, 4173795), (9, 2318775), (15, 1391265), (25, 834759), (27, 772925), (43, 485325), (45, 463755), (75, 278253), (129, 161775), (135, 154585), (215, 97065), (225, 92751), (387, 53925), (645, 32355), (675, 30917), (719, 29025), (1075, 19413), (1161, 17975), (1935, 10785), (2157, 9675), (3225, 6471), (3595, 5805)]