20821000

素因数分解:

$2^3\times 5^3\times {\mathrm{47}}^1\times {\mathrm{443}}^1$

素因数の和:511

約数の個数: 64

約数和(自身を含む): 49870080

約数和(自身を除く): 29049080

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 47, 50, 94, 100, 125, 188, 200, 235, 250, 376, 443, 470, 500, 886, 940, 1000, 1175, 1772, 1880, 2215, 2350, 3544, 4430, 4700, 5875, 8860, 9400, 11075, 11750, 17720, 20821, 22150, 23500, 41642, 44300, 47000, 55375, 83284, 88600, 104105, 110750, 166568, 208210, 221500, 416420, 443000, 520525, 832840, 1041050, 2082100, 2602625, 4164200, 5205250, 10410500, 20821000]

約数ペア:

[(1, 20821000), (2, 10410500), (4, 5205250), (5, 4164200), (8, 2602625), (10, 2082100), (20, 1041050), (25, 832840), (40, 520525), (47, 443000), (50, 416420), (94, 221500), (100, 208210), (125, 166568), (188, 110750), (200, 104105), (235, 88600), (250, 83284), (376, 55375), (443, 47000), (470, 44300), (500, 41642), (886, 23500), (940, 22150), (1000, 20821), (1175, 17720), (1772, 11750), (1880, 11075), (2215, 9400), (2350, 8860), (3544, 5875), (4430, 4700)]