19969375

素因数分解:

$5^4\times {\mathrm{89}}^1\times {\mathrm{359}}^1$

素因数の和:468

約数の個数: 20

約数和(自身を含む): 25304400

約数和(自身を除く): 5335025

約数列:

[1, 5, 25, 89, 125, 359, 445, 625, 1795, 2225, 8975, 11125, 31951, 44875, 55625, 159755, 224375, 798775, 3993875, 19969375]

約数ペア:

[(1, 19969375), (5, 3993875), (25, 798775), (89, 224375), (125, 159755), (359, 55625), (445, 44875), (625, 31951), (1795, 11125), (2225, 8975)]