20399860

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2531}}^1$

素因数の和:2584

約数の個数: 48

約数和(自身を含む): 47642112

約数和(自身を除く): 27242252

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 124, 130, 155, 260, 310, 403, 620, 806, 1612, 2015, 2531, 4030, 5062, 8060, 10124, 12655, 25310, 32903, 50620, 65806, 78461, 131612, 156922, 164515, 313844, 329030, 392305, 658060, 784610, 1019993, 1569220, 2039986, 4079972, 5099965, 10199930, 20399860]

約数ペア:

[(1, 20399860), (2, 10199930), (4, 5099965), (5, 4079972), (10, 2039986), (13, 1569220), (20, 1019993), (26, 784610), (31, 658060), (52, 392305), (62, 329030), (65, 313844), (124, 164515), (130, 156922), (155, 131612), (260, 78461), (310, 65806), (403, 50620), (620, 32903), (806, 25310), (1612, 12655), (2015, 10124), (2531, 8060), (4030, 5062)]