19978040

素因数分解:

$2^3\times 5^1\times {\mathrm{173}}^1\times {\mathrm{2887}}^1$

素因数の和:3071

約数の個数: 32

約数和(自身を含む): 45226080

約数和(自身を除く): 25248040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 173, 346, 692, 865, 1384, 1730, 2887, 3460, 5774, 6920, 11548, 14435, 23096, 28870, 57740, 115480, 499451, 998902, 1997804, 2497255, 3995608, 4994510, 9989020, 19978040]

約数ペア:

[(1, 19978040), (2, 9989020), (4, 4994510), (5, 3995608), (8, 2497255), (10, 1997804), (20, 998902), (40, 499451), (173, 115480), (346, 57740), (692, 28870), (865, 23096), (1384, 14435), (1730, 11548), (2887, 6920), (3460, 5774)]