19999216

素因数分解:

$2^4\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{661}}^1$

素因数の和:761

約数の個数: 40

約数和(自身を含む): 40715648

約数和(自身を除く): 20716432

約数列:

[1, 2, 4, 8, 16, 31, 61, 62, 122, 124, 244, 248, 488, 496, 661, 976, 1322, 1891, 2644, 3782, 5288, 7564, 10576, 15128, 20491, 30256, 40321, 40982, 80642, 81964, 161284, 163928, 322568, 327856, 645136, 1249951, 2499902, 4999804, 9999608, 19999216]

約数ペア:

[(1, 19999216), (2, 9999608), (4, 4999804), (8, 2499902), (16, 1249951), (31, 645136), (61, 327856), (62, 322568), (122, 163928), (124, 161284), (244, 81964), (248, 80642), (488, 40982), (496, 40321), (661, 30256), (976, 20491), (1322, 15128), (1891, 10576), (2644, 7564), (3782, 5288)]