20905808

素因数分解:

$2^4\times 7^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{239}}^1$

素因数の和:336

約数の個数: 80

約数和(自身を含む): 51425280

約数和(自身を除く): 30519472

約数列:

[1, 2, 4, 7, 8, 11, 14, 16, 22, 28, 44, 56, 71, 77, 88, 112, 142, 154, 176, 239, 284, 308, 478, 497, 568, 616, 781, 956, 994, 1136, 1232, 1562, 1673, 1912, 1988, 2629, 3124, 3346, 3824, 3976, 5258, 5467, 6248, 6692, 7952, 10516, 10934, 12496, 13384, 16969, 18403, 21032, 21868, 26768, 33938, 36806, 42064, 43736, 67876, 73612, 87472, 118783, 135752, 147224, 186659, 237566, 271504, 294448, 373318, 475132, 746636, 950264, 1306613, 1493272, 1900528, 2613226, 2986544, 5226452, 10452904, 20905808]

約数ペア:

[(1, 20905808), (2, 10452904), (4, 5226452), (7, 2986544), (8, 2613226), (11, 1900528), (14, 1493272), (16, 1306613), (22, 950264), (28, 746636), (44, 475132), (56, 373318), (71, 294448), (77, 271504), (88, 237566), (112, 186659), (142, 147224), (154, 135752), (176, 118783), (239, 87472), (284, 73612), (308, 67876), (478, 43736), (497, 42064), (568, 36806), (616, 33938), (781, 26768), (956, 21868), (994, 21032), (1136, 18403), (1232, 16969), (1562, 13384), (1673, 12496), (1912, 10934), (1988, 10516), (2629, 7952), (3124, 6692), (3346, 6248), (3824, 5467), (3976, 5258)]