18865775

素因数分解:

$5^2\times {\mathrm{61}}^1\times {\mathrm{89}}^1\times {\mathrm{139}}^1$

素因数の和:299

約数の個数: 24

約数和(自身を含む): 24217200

約数和(自身を除く): 5351425

約数列:

[1, 5, 25, 61, 89, 139, 305, 445, 695, 1525, 2225, 3475, 5429, 8479, 12371, 27145, 42395, 61855, 135725, 211975, 309275, 754631, 3773155, 18865775]

約数ペア:

[(1, 18865775), (5, 3773155), (25, 754631), (61, 309275), (89, 211975), (139, 135725), (305, 61855), (445, 42395), (695, 27145), (1525, 12371), (2225, 8479), (3475, 5429)]