21397905

素因数分解:

$3^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{5113}}^1$

素因数の和:5158

約数の個数: 32

約数和(自身を含む): 39275520

約数和(自身を除く): 17877615

約数列:

[1, 3, 5, 9, 15, 27, 31, 45, 93, 135, 155, 279, 465, 837, 1395, 4185, 5113, 15339, 25565, 46017, 76695, 138051, 158503, 230085, 475509, 690255, 792515, 1426527, 2377545, 4279581, 7132635, 21397905]

約数ペア:

[(1, 21397905), (3, 7132635), (5, 4279581), (9, 2377545), (15, 1426527), (27, 792515), (31, 690255), (45, 475509), (93, 230085), (135, 158503), (155, 138051), (279, 76695), (465, 46017), (837, 25565), (1395, 15339), (4185, 5113)]