640988426

素因数分解:

$2^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{487}}^1$

素因数の和:627

約数の個数: 64

約数和(自身を含む): 1133346816

約数和(自身を除く): 492358390

約数列:

[1, 2, 13, 23, 26, 31, 46, 62, 71, 142, 299, 403, 487, 598, 713, 806, 923, 974, 1426, 1633, 1846, 2201, 3266, 4402, 6331, 9269, 11201, 12662, 15097, 18538, 21229, 22402, 28613, 30194, 34577, 42458, 50623, 57226, 69154, 101246, 145613, 196261, 291226, 347231, 392522, 449501, 658099, 694462, 795271, 899002, 1071887, 1316198, 1590542, 2143774, 4514003, 9028006, 10338523, 13934531, 20677046, 24653401, 27869062, 49306802, 320494213, 640988426]

約数ペア:

[(1, 640988426), (2, 320494213), (13, 49306802), (23, 27869062), (26, 24653401), (31, 20677046), (46, 13934531), (62, 10338523), (71, 9028006), (142, 4514003), (299, 2143774), (403, 1590542), (487, 1316198), (598, 1071887), (713, 899002), (806, 795271), (923, 694462), (974, 658099), (1426, 449501), (1633, 392522), (1846, 347231), (2201, 291226), (3266, 196261), (4402, 145613), (6331, 101246), (9269, 69154), (11201, 57226), (12662, 50623), (15097, 42458), (18538, 34577), (21229, 30194), (22402, 28613)]