20989125

素因数分解:

$3^5\times 5^3\times {\mathrm{691}}^1$

素因数の和:721

約数の個数: 48

約数和(自身を含む): 39294528

約数和(自身を除く): 18305403

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 75, 81, 125, 135, 225, 243, 375, 405, 675, 691, 1125, 1215, 2025, 2073, 3375, 3455, 6075, 6219, 10125, 10365, 17275, 18657, 30375, 31095, 51825, 55971, 86375, 93285, 155475, 167913, 259125, 279855, 466425, 777375, 839565, 1399275, 2332125, 4197825, 6996375, 20989125]

約数ペア:

[(1, 20989125), (3, 6996375), (5, 4197825), (9, 2332125), (15, 1399275), (25, 839565), (27, 777375), (45, 466425), (75, 279855), (81, 259125), (125, 167913), (135, 155475), (225, 93285), (243, 86375), (375, 55971), (405, 51825), (675, 31095), (691, 30375), (1125, 18657), (1215, 17275), (2025, 10365), (2073, 10125), (3375, 6219), (3455, 6075)]