20781440

素因数分解:

$2^7\times 5^1\times {\mathrm{19}}^1\times {\mathrm{1709}}^1$

素因数の和:1747

約数の個数: 64

約数和(自身を含む): 52326000

約数和(自身を除く): 31544560

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 32, 38, 40, 64, 76, 80, 95, 128, 152, 160, 190, 304, 320, 380, 608, 640, 760, 1216, 1520, 1709, 2432, 3040, 3418, 6080, 6836, 8545, 12160, 13672, 17090, 27344, 32471, 34180, 54688, 64942, 68360, 109376, 129884, 136720, 162355, 218752, 259768, 273440, 324710, 519536, 546880, 649420, 1039072, 1093760, 1298840, 2078144, 2597680, 4156288, 5195360, 10390720, 20781440]

約数ペア:

[(1, 20781440), (2, 10390720), (4, 5195360), (5, 4156288), (8, 2597680), (10, 2078144), (16, 1298840), (19, 1093760), (20, 1039072), (32, 649420), (38, 546880), (40, 519536), (64, 324710), (76, 273440), (80, 259768), (95, 218752), (128, 162355), (152, 136720), (160, 129884), (190, 109376), (304, 68360), (320, 64942), (380, 54688), (608, 34180), (640, 32471), (760, 27344), (1216, 17090), (1520, 13672), (1709, 12160), (2432, 8545), (3040, 6836), (3418, 6080)]