19995556

素因数分解:

$2^2\times 7^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{509}}^1$

素因数の和:604

約数の個数: 48

約数和(自身を含む): 42497280

約数和(自身を除く): 22501724

約数列:

[1, 2, 4, 7, 14, 23, 28, 46, 61, 92, 122, 161, 244, 322, 427, 509, 644, 854, 1018, 1403, 1708, 2036, 2806, 3563, 5612, 7126, 9821, 11707, 14252, 19642, 23414, 31049, 39284, 46828, 62098, 81949, 124196, 163898, 217343, 327796, 434686, 714127, 869372, 1428254, 2856508, 4998889, 9997778, 19995556]

約数ペア:

[(1, 19995556), (2, 9997778), (4, 4998889), (7, 2856508), (14, 1428254), (23, 869372), (28, 714127), (46, 434686), (61, 327796), (92, 217343), (122, 163898), (161, 124196), (244, 81949), (322, 62098), (427, 46828), (509, 39284), (644, 31049), (854, 23414), (1018, 19642), (1403, 14252), (1708, 11707), (2036, 9821), (2806, 7126), (3563, 5612)]