81869840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78721}}^1$

素因数の和:78747

約数の個数: 40

約数和(自身を含む): 204992088

約数和(自身を除く): 123122248

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 78721, 157442, 314884, 393605, 629768, 787210, 1023373, 1259536, 1574420, 2046746, 3148840, 4093492, 5116865, 6297680, 8186984, 10233730, 16373968, 20467460, 40934920, 81869840]

約数ペア:

[(1, 81869840), (2, 40934920), (4, 20467460), (5, 16373968), (8, 10233730), (10, 8186984), (13, 6297680), (16, 5116865), (20, 4093492), (26, 3148840), (40, 2046746), (52, 1574420), (65, 1259536), (80, 1023373), (104, 787210), (130, 629768), (208, 393605), (260, 314884), (520, 157442), (1040, 78721)]