20243750

素因数分解:

$2^1\times 5^5\times {\mathrm{41}}^1\times {\mathrm{79}}^1$

素因数の和:147

約数の個数: 48

約数和(自身を含む): 39372480

約数和(自身を除く): 19128730

約数列:

[1, 2, 5, 10, 25, 41, 50, 79, 82, 125, 158, 205, 250, 395, 410, 625, 790, 1025, 1250, 1975, 2050, 3125, 3239, 3950, 5125, 6250, 6478, 9875, 10250, 16195, 19750, 25625, 32390, 49375, 51250, 80975, 98750, 128125, 161950, 246875, 256250, 404875, 493750, 809750, 2024375, 4048750, 10121875, 20243750]

約数ペア:

[(1, 20243750), (2, 10121875), (5, 4048750), (10, 2024375), (25, 809750), (41, 493750), (50, 404875), (79, 256250), (82, 246875), (125, 161950), (158, 128125), (205, 98750), (250, 80975), (395, 51250), (410, 49375), (625, 32390), (790, 25625), (1025, 19750), (1250, 16195), (1975, 10250), (2050, 9875), (3125, 6478), (3239, 6250), (3950, 5125)]