19918940

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{61}}^1\times {\mathrm{563}}^1$

素因数の和:662

約数の個数: 48

約数和(自身を含む): 44059680

約数和(自身を除く): 24140740

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 61, 116, 122, 145, 244, 290, 305, 563, 580, 610, 1126, 1220, 1769, 2252, 2815, 3538, 5630, 7076, 8845, 11260, 16327, 17690, 32654, 34343, 35380, 65308, 68686, 81635, 137372, 163270, 171715, 326540, 343430, 686860, 995947, 1991894, 3983788, 4979735, 9959470, 19918940]

約数ペア:

[(1, 19918940), (2, 9959470), (4, 4979735), (5, 3983788), (10, 1991894), (20, 995947), (29, 686860), (58, 343430), (61, 326540), (116, 171715), (122, 163270), (145, 137372), (244, 81635), (290, 68686), (305, 65308), (563, 35380), (580, 34343), (610, 32654), (1126, 17690), (1220, 16327), (1769, 11260), (2252, 8845), (2815, 7076), (3538, 5630)]