20808440

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{97}}^1\times {\mathrm{173}}^1$

素因数の和:312

約数の個数: 64

約数和(自身を含む): 49109760

約数和(自身を除く): 28301320

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 97, 124, 155, 173, 194, 248, 310, 346, 388, 485, 620, 692, 776, 865, 970, 1240, 1384, 1730, 1940, 3007, 3460, 3880, 5363, 6014, 6920, 10726, 12028, 15035, 16781, 21452, 24056, 26815, 30070, 33562, 42904, 53630, 60140, 67124, 83905, 107260, 120280, 134248, 167810, 214520, 335620, 520211, 671240, 1040422, 2080844, 2601055, 4161688, 5202110, 10404220, 20808440]

約数ペア:

[(1, 20808440), (2, 10404220), (4, 5202110), (5, 4161688), (8, 2601055), (10, 2080844), (20, 1040422), (31, 671240), (40, 520211), (62, 335620), (97, 214520), (124, 167810), (155, 134248), (173, 120280), (194, 107260), (248, 83905), (310, 67124), (346, 60140), (388, 53630), (485, 42904), (620, 33562), (692, 30070), (776, 26815), (865, 24056), (970, 21452), (1240, 16781), (1384, 15035), (1730, 12028), (1940, 10726), (3007, 6920), (3460, 6014), (3880, 5363)]