19998208

素因数分解:

$2^9\times {\mathrm{139}}^1\times {\mathrm{281}}^1$

素因数の和:438

約数の個数: 40

約数和(自身を含む): 40388040

約数和(自身を除く): 20389832

約数列:

[1, 2, 4, 8, 16, 32, 64, 128, 139, 256, 278, 281, 512, 556, 562, 1112, 1124, 2224, 2248, 4448, 4496, 8896, 8992, 17792, 17984, 35584, 35968, 39059, 71168, 71936, 78118, 143872, 156236, 312472, 624944, 1249888, 2499776, 4999552, 9999104, 19998208]

約数ペア:

[(1, 19998208), (2, 9999104), (4, 4999552), (8, 2499776), (16, 1249888), (32, 624944), (64, 312472), (128, 156236), (139, 143872), (256, 78118), (278, 71936), (281, 71168), (512, 39059), (556, 35968), (562, 35584), (1112, 17984), (1124, 17792), (2224, 8992), (2248, 8896), (4448, 4496)]