19637680

素因数分解:

$2^4\times 5^1\times {\mathrm{245471}}^1$

素因数の和:245484

約数の個数: 20

約数和(自身を含む): 45657792

約数和(自身を除く): 26020112

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 245471, 490942, 981884, 1227355, 1963768, 2454710, 3927536, 4909420, 9818840, 19637680]

約数ペア:

[(1, 19637680), (2, 9818840), (4, 4909420), (5, 3927536), (8, 2454710), (10, 1963768), (16, 1227355), (20, 981884), (40, 490942), (80, 245471)]