19809920

素因数分解:

$2^7\times 5^1\times {\mathrm{13}}^1\times {\mathrm{2381}}^1$

素因数の和:2413

約数の個数: 64

約数和(自身を含む): 51022440

約数和(自身を除く): 31212520

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 260, 320, 416, 520, 640, 832, 1040, 1664, 2080, 2381, 4160, 4762, 8320, 9524, 11905, 19048, 23810, 30953, 38096, 47620, 61906, 76192, 95240, 123812, 152384, 154765, 190480, 247624, 304768, 309530, 380960, 495248, 619060, 761920, 990496, 1238120, 1523840, 1980992, 2476240, 3961984, 4952480, 9904960, 19809920]

約数ペア:

[(1, 19809920), (2, 9904960), (4, 4952480), (5, 3961984), (8, 2476240), (10, 1980992), (13, 1523840), (16, 1238120), (20, 990496), (26, 761920), (32, 619060), (40, 495248), (52, 380960), (64, 309530), (65, 304768), (80, 247624), (104, 190480), (128, 154765), (130, 152384), (160, 123812), (208, 95240), (260, 76192), (320, 61906), (416, 47620), (520, 38096), (640, 30953), (832, 23810), (1040, 19048), (1664, 11905), (2080, 9524), (2381, 8320), (4160, 4762)]