19878640

素因数分解:

$2^4\times 5^1\times {\mathrm{248483}}^1$

素因数の和:248496

約数の個数: 20

約数和(自身を含む): 46218024

約数和(自身を除く): 26339384

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 248483, 496966, 993932, 1242415, 1987864, 2484830, 3975728, 4969660, 9939320, 19878640]

約数ペア:

[(1, 19878640), (2, 9939320), (4, 4969660), (5, 3975728), (8, 2484830), (10, 1987864), (16, 1242415), (20, 993932), (40, 496966), (80, 248483)]