20478320

素因数分解:

$2^4\times 5^1\times {\mathrm{43}}^1\times {\mathrm{5953}}^1$

素因数の和:6009

約数の個数: 40

約数和(自身を含む): 48727536

約数和(自身を除く): 28249216

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 43, 80, 86, 172, 215, 344, 430, 688, 860, 1720, 3440, 5953, 11906, 23812, 29765, 47624, 59530, 95248, 119060, 238120, 255979, 476240, 511958, 1023916, 1279895, 2047832, 2559790, 4095664, 5119580, 10239160, 20478320]

約数ペア:

[(1, 20478320), (2, 10239160), (4, 5119580), (5, 4095664), (8, 2559790), (10, 2047832), (16, 1279895), (20, 1023916), (40, 511958), (43, 476240), (80, 255979), (86, 238120), (172, 119060), (215, 95248), (344, 59530), (430, 47624), (688, 29765), (860, 23812), (1720, 11906), (3440, 5953)]