256506640

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{246641}}^1$

素因数の和:246667

約数の個数: 40

約数和(自身を含む): 642255768

約数和(自身を除く): 385749128

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 246641, 493282, 986564, 1233205, 1973128, 2466410, 3206333, 3946256, 4932820, 6412666, 9865640, 12825332, 16031665, 19731280, 25650664, 32063330, 51301328, 64126660, 128253320, 256506640]

約数ペア:

[(1, 256506640), (2, 128253320), (4, 64126660), (5, 51301328), (8, 32063330), (10, 25650664), (13, 19731280), (16, 16031665), (20, 12825332), (26, 9865640), (40, 6412666), (52, 4932820), (65, 3946256), (80, 3206333), (104, 2466410), (130, 1973128), (208, 1233205), (260, 986564), (520, 493282), (1040, 246641)]