399040540

素因数分解:

$2^2\times 5^1\times {\mathrm{97}}^1\times {\mathrm{103}}^1\times {\mathrm{1997}}^1$

素因数の和:2206

約数の個数: 48

約数和(自身を含む): 855271872

約数和(自身を除く): 456231332

約数列:

[1, 2, 4, 5, 10, 20, 97, 103, 194, 206, 388, 412, 485, 515, 970, 1030, 1940, 1997, 2060, 3994, 7988, 9985, 9991, 19970, 19982, 39940, 39964, 49955, 99910, 193709, 199820, 205691, 387418, 411382, 774836, 822764, 968545, 1028455, 1937090, 2056910, 3874180, 4113820, 19952027, 39904054, 79808108, 99760135, 199520270, 399040540]

約数ペア:

[(1, 399040540), (2, 199520270), (4, 99760135), (5, 79808108), (10, 39904054), (20, 19952027), (97, 4113820), (103, 3874180), (194, 2056910), (206, 1937090), (388, 1028455), (412, 968545), (485, 822764), (515, 774836), (970, 411382), (1030, 387418), (1940, 205691), (1997, 199820), (2060, 193709), (3994, 99910), (7988, 49955), (9985, 39964), (9991, 39940), (19970, 19982)]