81808720

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{347}}^1\times {\mathrm{421}}^1$

素因数の和:788

約数の個数: 80

約数和(自身を含む): 218521728

約数和(自身を除く): 136713008

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 280, 347, 421, 560, 694, 842, 1388, 1684, 1735, 2105, 2429, 2776, 2947, 3368, 3470, 4210, 4858, 5552, 5894, 6736, 6940, 8420, 9716, 11788, 12145, 13880, 14735, 16840, 19432, 23576, 24290, 27760, 29470, 33680, 38864, 47152, 48580, 58940, 97160, 117880, 146087, 194320, 235760, 292174, 584348, 730435, 1022609, 1168696, 1460870, 2045218, 2337392, 2921740, 4090436, 5113045, 5843480, 8180872, 10226090, 11686960, 16361744, 20452180, 40904360, 81808720]

約数ペア:

[(1, 81808720), (2, 40904360), (4, 20452180), (5, 16361744), (7, 11686960), (8, 10226090), (10, 8180872), (14, 5843480), (16, 5113045), (20, 4090436), (28, 2921740), (35, 2337392), (40, 2045218), (56, 1460870), (70, 1168696), (80, 1022609), (112, 730435), (140, 584348), (280, 292174), (347, 235760), (421, 194320), (560, 146087), (694, 117880), (842, 97160), (1388, 58940), (1684, 48580), (1735, 47152), (2105, 38864), (2429, 33680), (2776, 29470), (2947, 27760), (3368, 24290), (3470, 23576), (4210, 19432), (4858, 16840), (5552, 14735), (5894, 13880), (6736, 12145), (6940, 11788), (8420, 9716)]