20687500

素因数分解:

$2^2\times 5^6\times {\mathrm{331}}^1$

素因数の和:365

約数の個数: 42

約数和(自身を含む): 45390044

約数和(自身を除く): 24702544

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 125, 250, 331, 500, 625, 662, 1250, 1324, 1655, 2500, 3125, 3310, 6250, 6620, 8275, 12500, 15625, 16550, 31250, 33100, 41375, 62500, 82750, 165500, 206875, 413750, 827500, 1034375, 2068750, 4137500, 5171875, 10343750, 20687500]

約数ペア:

[(1, 20687500), (2, 10343750), (4, 5171875), (5, 4137500), (10, 2068750), (20, 1034375), (25, 827500), (50, 413750), (100, 206875), (125, 165500), (250, 82750), (331, 62500), (500, 41375), (625, 33100), (662, 31250), (1250, 16550), (1324, 15625), (1655, 12500), (2500, 8275), (3125, 6620), (3310, 6250)]