20388915

素因数分解:

$3^5\times 5^1\times {\mathrm{97}}^1\times {\mathrm{173}}^1$

素因数の和:290

約数の個数: 48

約数和(自身を含む): 37241568

約数和(自身を除く): 16852653

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 97, 135, 173, 243, 291, 405, 485, 519, 865, 873, 1215, 1455, 1557, 2595, 2619, 4365, 4671, 7785, 7857, 13095, 14013, 16781, 23355, 23571, 39285, 42039, 50343, 70065, 83905, 117855, 151029, 210195, 251715, 453087, 755145, 1359261, 2265435, 4077783, 6796305, 20388915]

約数ペア:

[(1, 20388915), (3, 6796305), (5, 4077783), (9, 2265435), (15, 1359261), (27, 755145), (45, 453087), (81, 251715), (97, 210195), (135, 151029), (173, 117855), (243, 83905), (291, 70065), (405, 50343), (485, 42039), (519, 39285), (865, 23571), (873, 23355), (1215, 16781), (1455, 14013), (1557, 13095), (2595, 7857), (2619, 7785), (4365, 4671)]