21780225

素因数分解:

$3^3\times 5^2\times {\mathrm{41}}^1\times {\mathrm{787}}^1$

素因数の和:847

約数の個数: 48

約数和(自身を含む): 41039040

約数和(自身を除く): 19258815

約数列:

[1, 3, 5, 9, 15, 25, 27, 41, 45, 75, 123, 135, 205, 225, 369, 615, 675, 787, 1025, 1107, 1845, 2361, 3075, 3935, 5535, 7083, 9225, 11805, 19675, 21249, 27675, 32267, 35415, 59025, 96801, 106245, 161335, 177075, 290403, 484005, 531225, 806675, 871209, 1452015, 2420025, 4356045, 7260075, 21780225]

約数ペア:

[(1, 21780225), (3, 7260075), (5, 4356045), (9, 2420025), (15, 1452015), (25, 871209), (27, 806675), (41, 531225), (45, 484005), (75, 290403), (123, 177075), (135, 161335), (205, 106245), (225, 96801), (369, 59025), (615, 35415), (675, 32267), (787, 27675), (1025, 21249), (1107, 19675), (1845, 11805), (2361, 9225), (3075, 7083), (3935, 5535)]