500000020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{29}}^1\times {\mathrm{5101}}^1$

素因数の和:5165

約数の個数: 72

約数和(自身を含む): 1176419160

約数和(自身を除く): 676419140

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 29, 52, 58, 65, 116, 130, 145, 169, 260, 290, 338, 377, 580, 676, 754, 845, 1508, 1690, 1885, 3380, 3770, 4901, 5101, 7540, 9802, 10202, 19604, 20404, 24505, 25505, 49010, 51010, 66313, 98020, 102020, 132626, 147929, 265252, 295858, 331565, 591716, 663130, 739645, 862069, 1326260, 1479290, 1724138, 1923077, 2958580, 3448276, 3846154, 4310345, 7692308, 8620690, 9615385, 17241380, 19230770, 25000001, 38461540, 50000002, 100000004, 125000005, 250000010, 500000020]

約数ペア:

[(1, 500000020), (2, 250000010), (4, 125000005), (5, 100000004), (10, 50000002), (13, 38461540), (20, 25000001), (26, 19230770), (29, 17241380), (52, 9615385), (58, 8620690), (65, 7692308), (116, 4310345), (130, 3846154), (145, 3448276), (169, 2958580), (260, 1923077), (290, 1724138), (338, 1479290), (377, 1326260), (580, 862069), (676, 739645), (754, 663130), (845, 591716), (1508, 331565), (1690, 295858), (1885, 265252), (3380, 147929), (3770, 132626), (4901, 102020), (5101, 98020), (7540, 66313), (9802, 51010), (10202, 49010), (19604, 25505), (20404, 24505)]