21315

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{29}}^1$

素因数の和:51

約数の個数: 24

約数和(自身を含む): 41040

約数和(自身を除く): 19725

約数列:

[1, 3, 5, 7, 15, 21, 29, 35, 49, 87, 105, 145, 147, 203, 245, 435, 609, 735, 1015, 1421, 3045, 4263, 7105, 21315]

約数ペア:

[(1, 21315), (3, 7105), (5, 4263), (7, 3045), (15, 1421), (21, 1015), (29, 735), (35, 609), (49, 435), (87, 245), (105, 203), (145, 147)]