20721120

素因数分解:

$2^5\times 3^1\times 5^1\times 7^2\times {\mathrm{881}}^1$

素因数の和:913

約数の個数: 144

約数和(自身を含む): 76014288

約数和(自身を除く): 55293168

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 30, 32, 35, 40, 42, 48, 49, 56, 60, 70, 80, 84, 96, 98, 105, 112, 120, 140, 147, 160, 168, 196, 210, 224, 240, 245, 280, 294, 336, 392, 420, 480, 490, 560, 588, 672, 735, 784, 840, 881, 980, 1120, 1176, 1470, 1568, 1680, 1762, 1960, 2352, 2643, 2940, 3360, 3524, 3920, 4405, 4704, 5286, 5880, 6167, 7048, 7840, 8810, 10572, 11760, 12334, 13215, 14096, 17620, 18501, 21144, 23520, 24668, 26430, 28192, 30835, 35240, 37002, 42288, 43169, 49336, 52860, 61670, 70480, 74004, 84576, 86338, 92505, 98672, 105720, 123340, 129507, 140960, 148008, 172676, 185010, 197344, 211440, 215845, 246680, 259014, 296016, 345352, 370020, 422880, 431690, 493360, 518028, 592032, 647535, 690704, 740040, 863380, 986720, 1036056, 1295070, 1381408, 1480080, 1726760, 2072112, 2590140, 2960160, 3453520, 4144224, 5180280, 6907040, 10360560, 20721120]

約数ペア:

[(1, 20721120), (2, 10360560), (3, 6907040), (4, 5180280), (5, 4144224), (6, 3453520), (7, 2960160), (8, 2590140), (10, 2072112), (12, 1726760), (14, 1480080), (15, 1381408), (16, 1295070), (20, 1036056), (21, 986720), (24, 863380), (28, 740040), (30, 690704), (32, 647535), (35, 592032), (40, 518028), (42, 493360), (48, 431690), (49, 422880), (56, 370020), (60, 345352), (70, 296016), (80, 259014), (84, 246680), (96, 215845), (98, 211440), (105, 197344), (112, 185010), (120, 172676), (140, 148008), (147, 140960), (160, 129507), (168, 123340), (196, 105720), (210, 98672), (224, 92505), (240, 86338), (245, 84576), (280, 74004), (294, 70480), (336, 61670), (392, 52860), (420, 49336), (480, 43169), (490, 42288), (560, 37002), (588, 35240), (672, 30835), (735, 28192), (784, 26430), (840, 24668), (881, 23520), (980, 21144), (1120, 18501), (1176, 17620), (1470, 14096), (1568, 13215), (1680, 12334), (1762, 11760), (1960, 10572), (2352, 8810), (2643, 7840), (2940, 7048), (3360, 6167), (3524, 5880), (3920, 5286), (4405, 4704)]