20397860

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{367}}^1\times {\mathrm{397}}^1$

素因数の和:780

約数の個数: 48

約数和(自身を含む): 49211904

約数和(自身を除く): 28814044

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 367, 397, 734, 794, 1468, 1588, 1835, 1985, 2569, 2779, 3670, 3970, 5138, 5558, 7340, 7940, 10276, 11116, 12845, 13895, 25690, 27790, 51380, 55580, 145699, 291398, 582796, 728495, 1019893, 1456990, 2039786, 2913980, 4079572, 5099465, 10198930, 20397860]

約数ペア:

[(1, 20397860), (2, 10198930), (4, 5099465), (5, 4079572), (7, 2913980), (10, 2039786), (14, 1456990), (20, 1019893), (28, 728495), (35, 582796), (70, 291398), (140, 145699), (367, 55580), (397, 51380), (734, 27790), (794, 25690), (1468, 13895), (1588, 12845), (1835, 11116), (1985, 10276), (2569, 7940), (2779, 7340), (3670, 5558), (3970, 5138)]