21747760

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15991}}^1$

素因数の和:16021

約数の個数: 40

約数和(自身を含む): 53541216

約数和(自身を除く): 31793456

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15991, 31982, 63964, 79955, 127928, 159910, 255856, 271847, 319820, 543694, 639640, 1087388, 1279280, 1359235, 2174776, 2718470, 4349552, 5436940, 10873880, 21747760]

約数ペア:

[(1, 21747760), (2, 10873880), (4, 5436940), (5, 4349552), (8, 2718470), (10, 2174776), (16, 1359235), (17, 1279280), (20, 1087388), (34, 639640), (40, 543694), (68, 319820), (80, 271847), (85, 255856), (136, 159910), (170, 127928), (272, 79955), (340, 63964), (680, 31982), (1360, 15991)]