20657025

素因数分解:

$3^4\times 5^2\times {\mathrm{101}}^2$

素因数の和:224

約数の個数: 45

約数和(自身を含む): 38646553

約数和(自身を除く): 17989528

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 75, 81, 101, 135, 225, 303, 405, 505, 675, 909, 1515, 2025, 2525, 2727, 4545, 7575, 8181, 10201, 13635, 22725, 30603, 40905, 51005, 68175, 91809, 153015, 204525, 255025, 275427, 459045, 765075, 826281, 1377135, 2295225, 4131405, 6885675, 20657025]

約数ペア:

[(1, 20657025), (3, 6885675), (5, 4131405), (9, 2295225), (15, 1377135), (25, 826281), (27, 765075), (45, 459045), (75, 275427), (81, 255025), (101, 204525), (135, 153015), (225, 91809), (303, 68175), (405, 51005), (505, 40905), (675, 30603), (909, 22725), (1515, 13635), (2025, 10201), (2525, 8181), (2727, 7575)]