21388275

素因数分解:

$3^2\times 5^2\times {\mathrm{23}}^1\times {\mathrm{4133}}^1$

素因数の和:4172

約数の個数: 36

約数和(自身を含む): 39984048

約数和(自身を除く): 18595773

約数列:

[1, 3, 5, 9, 15, 23, 25, 45, 69, 75, 115, 207, 225, 345, 575, 1035, 1725, 4133, 5175, 12399, 20665, 37197, 61995, 95059, 103325, 185985, 285177, 309975, 475295, 855531, 929925, 1425885, 2376475, 4277655, 7129425, 21388275]

約数ペア:

[(1, 21388275), (3, 7129425), (5, 4277655), (9, 2376475), (15, 1425885), (23, 929925), (25, 855531), (45, 475295), (69, 309975), (75, 285177), (115, 185985), (207, 103325), (225, 95059), (345, 61995), (575, 37197), (1035, 20665), (1725, 12399), (4133, 5175)]