19970000

素因数分解:

$2^4\times 5^4\times {\mathrm{1997}}^1$

素因数の和:2025

約数の個数: 50

約数和(自身を含む): 48373578

約数和(自身を除く): 28403578

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 625, 1000, 1250, 1997, 2000, 2500, 3994, 5000, 7988, 9985, 10000, 15976, 19970, 31952, 39940, 49925, 79880, 99850, 159760, 199700, 249625, 399400, 499250, 798800, 998500, 1248125, 1997000, 2496250, 3994000, 4992500, 9985000, 19970000]

約数ペア:

[(1, 19970000), (2, 9985000), (4, 4992500), (5, 3994000), (8, 2496250), (10, 1997000), (16, 1248125), (20, 998500), (25, 798800), (40, 499250), (50, 399400), (80, 249625), (100, 199700), (125, 159760), (200, 99850), (250, 79880), (400, 49925), (500, 39940), (625, 31952), (1000, 19970), (1250, 15976), (1997, 10000), (2000, 9985), (2500, 7988), (3994, 5000)]