21005992

素因数分解:

$2^3\times 7^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{347}}^1$

素因数の和:430

約数の個数: 64

約数和(自身を含む): 48107520

約数和(自身を除く): 27101528

約数列:

[1, 2, 4, 7, 8, 14, 23, 28, 46, 47, 56, 92, 94, 161, 184, 188, 322, 329, 347, 376, 644, 658, 694, 1081, 1288, 1316, 1388, 2162, 2429, 2632, 2776, 4324, 4858, 7567, 7981, 8648, 9716, 15134, 15962, 16309, 19432, 30268, 31924, 32618, 55867, 60536, 63848, 65236, 111734, 114163, 130472, 223468, 228326, 375107, 446936, 456652, 750214, 913304, 1500428, 2625749, 3000856, 5251498, 10502996, 21005992]

約数ペア:

[(1, 21005992), (2, 10502996), (4, 5251498), (7, 3000856), (8, 2625749), (14, 1500428), (23, 913304), (28, 750214), (46, 456652), (47, 446936), (56, 375107), (92, 228326), (94, 223468), (161, 130472), (184, 114163), (188, 111734), (322, 65236), (329, 63848), (347, 60536), (376, 55867), (644, 32618), (658, 31924), (694, 30268), (1081, 19432), (1288, 16309), (1316, 15962), (1388, 15134), (2162, 9716), (2429, 8648), (2632, 7981), (2776, 7567), (4324, 4858)]