19945000

素因数分解:

$2^3\times 5^4\times {\mathrm{3989}}^1$

素因数の和:4015

約数の個数: 40

約数和(自身を含む): 46742850

約数和(自身を除く): 26797850

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 625, 1000, 1250, 2500, 3989, 5000, 7978, 15956, 19945, 31912, 39890, 79780, 99725, 159560, 199450, 398900, 498625, 797800, 997250, 1994500, 2493125, 3989000, 4986250, 9972500, 19945000]

約数ペア:

[(1, 19945000), (2, 9972500), (4, 4986250), (5, 3989000), (8, 2493125), (10, 1994500), (20, 997250), (25, 797800), (40, 498625), (50, 398900), (100, 199450), (125, 159560), (200, 99725), (250, 79780), (500, 39890), (625, 31912), (1000, 19945), (1250, 15956), (2500, 7978), (3989, 5000)]