18784840

素因数分解:

$2^3\times 5^1\times {\mathrm{251}}^1\times {\mathrm{1871}}^1$

素因数の和:2133

約数の個数: 32

約数和(自身を含む): 42456960

約数和(自身を除く): 23672120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 251, 502, 1004, 1255, 1871, 2008, 2510, 3742, 5020, 7484, 9355, 10040, 14968, 18710, 37420, 74840, 469621, 939242, 1878484, 2348105, 3756968, 4696210, 9392420, 18784840]

約数ペア:

[(1, 18784840), (2, 9392420), (4, 4696210), (5, 3756968), (8, 2348105), (10, 1878484), (20, 939242), (40, 469621), (251, 74840), (502, 37420), (1004, 18710), (1255, 14968), (1871, 10040), (2008, 9355), (2510, 7484), (3742, 5020)]