20991525

素因数分解:

$3^1\times 5^2\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{283}}^1$

素因数の和:362

約数の個数: 48

約数和(自身を含む): 37188096

約数和(自身を除く): 16196571

約数列:

[1, 3, 5, 15, 23, 25, 43, 69, 75, 115, 129, 215, 283, 345, 575, 645, 849, 989, 1075, 1415, 1725, 2967, 3225, 4245, 4945, 6509, 7075, 12169, 14835, 19527, 21225, 24725, 32545, 36507, 60845, 74175, 97635, 162725, 182535, 279887, 304225, 488175, 839661, 912675, 1399435, 4198305, 6997175, 20991525]

約数ペア:

[(1, 20991525), (3, 6997175), (5, 4198305), (15, 1399435), (23, 912675), (25, 839661), (43, 488175), (69, 304225), (75, 279887), (115, 182535), (129, 162725), (215, 97635), (283, 74175), (345, 60845), (575, 36507), (645, 32545), (849, 24725), (989, 21225), (1075, 19527), (1415, 14835), (1725, 12169), (2967, 7075), (3225, 6509), (4245, 4945)]