19889428

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{491}}^1$

素因数の和:568

約数の個数: 48

約数和(自身を含む): 40501440

約数和(自身を除く): 20612012

約数列:

[1, 2, 4, 13, 19, 26, 38, 41, 52, 76, 82, 164, 247, 491, 494, 533, 779, 982, 988, 1066, 1558, 1964, 2132, 3116, 6383, 9329, 10127, 12766, 18658, 20131, 20254, 25532, 37316, 40262, 40508, 80524, 121277, 242554, 261703, 382489, 485108, 523406, 764978, 1046812, 1529956, 4972357, 9944714, 19889428]

約数ペア:

[(1, 19889428), (2, 9944714), (4, 4972357), (13, 1529956), (19, 1046812), (26, 764978), (38, 523406), (41, 485108), (52, 382489), (76, 261703), (82, 242554), (164, 121277), (247, 80524), (491, 40508), (494, 40262), (533, 37316), (779, 25532), (982, 20254), (988, 20131), (1066, 18658), (1558, 12766), (1964, 10127), (2132, 9329), (3116, 6383)]