19738640

素因数分解:

$2^4\times 5^1\times {\mathrm{251}}^1\times {\mathrm{983}}^1$

素因数の和:1247

約数の個数: 40

約数和(自身を含む): 46122048

約数和(自身を除く): 26383408

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 251, 502, 983, 1004, 1255, 1966, 2008, 2510, 3932, 4016, 4915, 5020, 7864, 9830, 10040, 15728, 19660, 20080, 39320, 78640, 246733, 493466, 986932, 1233665, 1973864, 2467330, 3947728, 4934660, 9869320, 19738640]

約数ペア:

[(1, 19738640), (2, 9869320), (4, 4934660), (5, 3947728), (8, 2467330), (10, 1973864), (16, 1233665), (20, 986932), (40, 493466), (80, 246733), (251, 78640), (502, 39320), (983, 20080), (1004, 19660), (1255, 15728), (1966, 10040), (2008, 9830), (2510, 7864), (3932, 5020), (4016, 4915)]