21397990

素因数分解:

$2^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{112621}}^1$

素因数の和:112647

約数の個数: 16

約数和(自身を含む): 40543920

約数和(自身を除く): 19145930

約数列:

[1, 2, 5, 10, 19, 38, 95, 190, 112621, 225242, 563105, 1126210, 2139799, 4279598, 10698995, 21397990]

約数ペア:

[(1, 21397990), (2, 10698995), (5, 4279598), (10, 2139799), (19, 1126210), (38, 563105), (95, 225242), (190, 112621)]