20161987180

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^2\times {\mathrm{61}}^1\times {\mathrm{45779}}^1$

素因数の和:45887

約数の個数: 72

約数和(自身を含む): 45419436720

約数和(自身を除く): 25257449540

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 61, 76, 95, 122, 190, 244, 305, 361, 380, 610, 722, 1159, 1220, 1444, 1805, 2318, 3610, 4636, 5795, 7220, 11590, 22021, 23180, 44042, 45779, 88084, 91558, 110105, 183116, 220210, 228895, 440420, 457790, 869801, 915580, 1739602, 2792519, 3479204, 4349005, 5585038, 8698010, 11170076, 13962595, 16526219, 17396020, 27925190, 33052438, 53057861, 55850380, 66104876, 82631095, 106115722, 165262190, 212231444, 265289305, 330524380, 530578610, 1008099359, 1061157220, 2016198718, 4032397436, 5040496795, 10080993590, 20161987180]

約数ペア:

[(1, 20161987180), (2, 10080993590), (4, 5040496795), (5, 4032397436), (10, 2016198718), (19, 1061157220), (20, 1008099359), (38, 530578610), (61, 330524380), (76, 265289305), (95, 212231444), (122, 165262190), (190, 106115722), (244, 82631095), (305, 66104876), (361, 55850380), (380, 53057861), (610, 33052438), (722, 27925190), (1159, 17396020), (1220, 16526219), (1444, 13962595), (1805, 11170076), (2318, 8698010), (3610, 5585038), (4636, 4349005), (5795, 3479204), (7220, 2792519), (11590, 1739602), (22021, 915580), (23180, 869801), (44042, 457790), (45779, 440420), (88084, 228895), (91558, 220210), (110105, 183116)]