19505980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{29}}^1\times {\mathrm{199}}^1$

素因数の和:263

約数の個数: 72

約数和(自身を含む): 46116000

約数和(自身を除く): 26610020

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 29, 52, 58, 65, 116, 130, 145, 169, 199, 260, 290, 338, 377, 398, 580, 676, 754, 796, 845, 995, 1508, 1690, 1885, 1990, 2587, 3380, 3770, 3980, 4901, 5174, 5771, 7540, 9802, 10348, 11542, 12935, 19604, 23084, 24505, 25870, 28855, 33631, 49010, 51740, 57710, 67262, 75023, 98020, 115420, 134524, 150046, 168155, 300092, 336310, 375115, 672620, 750230, 975299, 1500460, 1950598, 3901196, 4876495, 9752990, 19505980]

約数ペア:

[(1, 19505980), (2, 9752990), (4, 4876495), (5, 3901196), (10, 1950598), (13, 1500460), (20, 975299), (26, 750230), (29, 672620), (52, 375115), (58, 336310), (65, 300092), (116, 168155), (130, 150046), (145, 134524), (169, 115420), (199, 98020), (260, 75023), (290, 67262), (338, 57710), (377, 51740), (398, 49010), (580, 33631), (676, 28855), (754, 25870), (796, 24505), (845, 23084), (995, 19604), (1508, 12935), (1690, 11542), (1885, 10348), (1990, 9802), (2587, 7540), (3380, 5771), (3770, 5174), (3980, 4901)]