18947840

素因数分解:

$2^8\times 5^1\times {\mathrm{113}}^1\times {\mathrm{131}}^1$

素因数の和:265

約数の個数: 72

約数和(自身を含む): 46137168

約数和(自身を除く): 27189328

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 113, 128, 131, 160, 226, 256, 262, 320, 452, 524, 565, 640, 655, 904, 1048, 1130, 1280, 1310, 1808, 2096, 2260, 2620, 3616, 4192, 4520, 5240, 7232, 8384, 9040, 10480, 14464, 14803, 16768, 18080, 20960, 28928, 29606, 33536, 36160, 41920, 59212, 72320, 74015, 83840, 118424, 144640, 148030, 167680, 236848, 296060, 473696, 592120, 947392, 1184240, 1894784, 2368480, 3789568, 4736960, 9473920, 18947840]

約数ペア:

[(1, 18947840), (2, 9473920), (4, 4736960), (5, 3789568), (8, 2368480), (10, 1894784), (16, 1184240), (20, 947392), (32, 592120), (40, 473696), (64, 296060), (80, 236848), (113, 167680), (128, 148030), (131, 144640), (160, 118424), (226, 83840), (256, 74015), (262, 72320), (320, 59212), (452, 41920), (524, 36160), (565, 33536), (640, 29606), (655, 28928), (904, 20960), (1048, 18080), (1130, 16768), (1280, 14803), (1310, 14464), (1808, 10480), (2096, 9040), (2260, 8384), (2620, 7232), (3616, 5240), (4192, 4520)]