21666680

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{223}}^1\times {\mathrm{347}}^1$

素因数の和:588

約数の個数: 64

約数和(自身を含む): 56125440

約数和(自身を除く): 34458760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 223, 280, 347, 446, 694, 892, 1115, 1388, 1561, 1735, 1784, 2230, 2429, 2776, 3122, 3470, 4460, 4858, 6244, 6940, 7805, 8920, 9716, 12145, 12488, 13880, 15610, 19432, 24290, 31220, 48580, 62440, 77381, 97160, 154762, 309524, 386905, 541667, 619048, 773810, 1083334, 1547620, 2166668, 2708335, 3095240, 4333336, 5416670, 10833340, 21666680]

約数ペア:

[(1, 21666680), (2, 10833340), (4, 5416670), (5, 4333336), (7, 3095240), (8, 2708335), (10, 2166668), (14, 1547620), (20, 1083334), (28, 773810), (35, 619048), (40, 541667), (56, 386905), (70, 309524), (140, 154762), (223, 97160), (280, 77381), (347, 62440), (446, 48580), (694, 31220), (892, 24290), (1115, 19432), (1388, 15610), (1561, 13880), (1735, 12488), (1784, 12145), (2230, 9716), (2429, 8920), (2776, 7805), (3122, 6940), (3470, 6244), (4460, 4858)]