21987256

素因数分解:

$2^3\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1\times {\mathrm{127}}^1$

素因数の和:236

約数の個数: 64

約数和(自身を含む): 47001600

約数和(自身を除く): 25014344

約数列:

[1, 2, 4, 8, 17, 19, 34, 38, 67, 68, 76, 127, 134, 136, 152, 254, 268, 323, 508, 536, 646, 1016, 1139, 1273, 1292, 2159, 2278, 2413, 2546, 2584, 4318, 4556, 4826, 5092, 8509, 8636, 9112, 9652, 10184, 17018, 17272, 19304, 21641, 34036, 41021, 43282, 68072, 82042, 86564, 144653, 161671, 164084, 173128, 289306, 323342, 328168, 578612, 646684, 1157224, 1293368, 2748407, 5496814, 10993628, 21987256]

約数ペア:

[(1, 21987256), (2, 10993628), (4, 5496814), (8, 2748407), (17, 1293368), (19, 1157224), (34, 646684), (38, 578612), (67, 328168), (68, 323342), (76, 289306), (127, 173128), (134, 164084), (136, 161671), (152, 144653), (254, 86564), (268, 82042), (323, 68072), (508, 43282), (536, 41021), (646, 34036), (1016, 21641), (1139, 19304), (1273, 17272), (1292, 17018), (2159, 10184), (2278, 9652), (2413, 9112), (2546, 8636), (2584, 8509), (4318, 5092), (4556, 4826)]