20821500

素因数分解:

$2^2\times 3^2\times 5^3\times 7^1\times {\mathrm{661}}^1$

素因数の和:693

約数の個数: 144

約数和(自身を含む): 75182016

約数和(自身を除く): 54360516

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 25, 28, 30, 35, 36, 42, 45, 50, 60, 63, 70, 75, 84, 90, 100, 105, 125, 126, 140, 150, 175, 180, 210, 225, 250, 252, 300, 315, 350, 375, 420, 450, 500, 525, 630, 661, 700, 750, 875, 900, 1050, 1125, 1260, 1322, 1500, 1575, 1750, 1983, 2100, 2250, 2625, 2644, 3150, 3305, 3500, 3966, 4500, 4627, 5250, 5949, 6300, 6610, 7875, 7932, 9254, 9915, 10500, 11898, 13220, 13881, 15750, 16525, 18508, 19830, 23135, 23796, 27762, 29745, 31500, 33050, 39660, 41643, 46270, 49575, 55524, 59490, 66100, 69405, 82625, 83286, 92540, 99150, 115675, 118980, 138810, 148725, 165250, 166572, 198300, 208215, 231350, 247875, 277620, 297450, 330500, 347025, 416430, 462700, 495750, 578375, 594900, 694050, 743625, 832860, 991500, 1041075, 1156750, 1388100, 1487250, 1735125, 2082150, 2313500, 2974500, 3470250, 4164300, 5205375, 6940500, 10410750, 20821500]

約数ペア:

[(1, 20821500), (2, 10410750), (3, 6940500), (4, 5205375), (5, 4164300), (6, 3470250), (7, 2974500), (9, 2313500), (10, 2082150), (12, 1735125), (14, 1487250), (15, 1388100), (18, 1156750), (20, 1041075), (21, 991500), (25, 832860), (28, 743625), (30, 694050), (35, 594900), (36, 578375), (42, 495750), (45, 462700), (50, 416430), (60, 347025), (63, 330500), (70, 297450), (75, 277620), (84, 247875), (90, 231350), (100, 208215), (105, 198300), (125, 166572), (126, 165250), (140, 148725), (150, 138810), (175, 118980), (180, 115675), (210, 99150), (225, 92540), (250, 83286), (252, 82625), (300, 69405), (315, 66100), (350, 59490), (375, 55524), (420, 49575), (450, 46270), (500, 41643), (525, 39660), (630, 33050), (661, 31500), (700, 29745), (750, 27762), (875, 23796), (900, 23135), (1050, 19830), (1125, 18508), (1260, 16525), (1322, 15750), (1500, 13881), (1575, 13220), (1750, 11898), (1983, 10500), (2100, 9915), (2250, 9254), (2625, 7932), (2644, 7875), (3150, 6610), (3305, 6300), (3500, 5949), (3966, 5250), (4500, 4627)]