19991504

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{223}}^1\times {\mathrm{431}}^1$

素因数の和:675

約数の個数: 40

約数和(自身を含む): 41997312

約数和(自身を除く): 22005808

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 223, 431, 446, 862, 892, 1724, 1784, 2899, 3448, 3568, 5603, 5798, 6896, 11206, 11596, 22412, 23192, 44824, 46384, 89648, 96113, 192226, 384452, 768904, 1249469, 1537808, 2498938, 4997876, 9995752, 19991504]

約数ペア:

[(1, 19991504), (2, 9995752), (4, 4997876), (8, 2498938), (13, 1537808), (16, 1249469), (26, 768904), (52, 384452), (104, 192226), (208, 96113), (223, 89648), (431, 46384), (446, 44824), (862, 23192), (892, 22412), (1724, 11596), (1784, 11206), (2899, 6896), (3448, 5798), (3568, 5603)]