21653840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{443}}^1$

素因数の和:516

約数の個数: 80

約数和(自身を含む): 55496448

約数和(自身を除く): 33842608

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 47, 52, 65, 80, 94, 104, 130, 188, 208, 235, 260, 376, 443, 470, 520, 611, 752, 886, 940, 1040, 1222, 1772, 1880, 2215, 2444, 3055, 3544, 3760, 4430, 4888, 5759, 6110, 7088, 8860, 9776, 11518, 12220, 17720, 20821, 23036, 24440, 28795, 35440, 41642, 46072, 48880, 57590, 83284, 92144, 104105, 115180, 166568, 208210, 230360, 270673, 333136, 416420, 460720, 541346, 832840, 1082692, 1353365, 1665680, 2165384, 2706730, 4330768, 5413460, 10826920, 21653840]

約数ペア:

[(1, 21653840), (2, 10826920), (4, 5413460), (5, 4330768), (8, 2706730), (10, 2165384), (13, 1665680), (16, 1353365), (20, 1082692), (26, 832840), (40, 541346), (47, 460720), (52, 416420), (65, 333136), (80, 270673), (94, 230360), (104, 208210), (130, 166568), (188, 115180), (208, 104105), (235, 92144), (260, 83284), (376, 57590), (443, 48880), (470, 46072), (520, 41642), (611, 35440), (752, 28795), (886, 24440), (940, 23036), (1040, 20821), (1222, 17720), (1772, 12220), (1880, 11518), (2215, 9776), (2444, 8860), (3055, 7088), (3544, 6110), (3760, 5759), (4430, 4888)]