20721015

素因数分解:

$3^4\times 5^1\times 7^1\times {\mathrm{7309}}^1$

素因数の和:7333

約数の個数: 40

約数和(自身を含む): 42456480

約数和(自身を除く): 21735465

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 81, 105, 135, 189, 315, 405, 567, 945, 2835, 7309, 21927, 36545, 51163, 65781, 109635, 153489, 197343, 255815, 328905, 460467, 592029, 767445, 986715, 1381401, 2302335, 2960145, 4144203, 6907005, 20721015]

約数ペア:

[(1, 20721015), (3, 6907005), (5, 4144203), (7, 2960145), (9, 2302335), (15, 1381401), (21, 986715), (27, 767445), (35, 592029), (45, 460467), (63, 328905), (81, 255815), (105, 197343), (135, 153489), (189, 109635), (315, 65781), (405, 51163), (567, 36545), (945, 21927), (2835, 7309)]