20811808

素因数分解:

$2^5\times {\mathrm{17}}^1\times {\mathrm{67}}^1\times {\mathrm{571}}^1$

素因数の和:665

約数の個数: 48

約数和(自身を含む): 44108064

約数和(自身を除く): 23296256

約数列:

[1, 2, 4, 8, 16, 17, 32, 34, 67, 68, 134, 136, 268, 272, 536, 544, 571, 1072, 1139, 1142, 2144, 2278, 2284, 4556, 4568, 9112, 9136, 9707, 18224, 18272, 19414, 36448, 38257, 38828, 76514, 77656, 153028, 155312, 306056, 310624, 612112, 650369, 1224224, 1300738, 2601476, 5202952, 10405904, 20811808]

約数ペア:

[(1, 20811808), (2, 10405904), (4, 5202952), (8, 2601476), (16, 1300738), (17, 1224224), (32, 650369), (34, 612112), (67, 310624), (68, 306056), (134, 155312), (136, 153028), (268, 77656), (272, 76514), (536, 38828), (544, 38257), (571, 36448), (1072, 19414), (1139, 18272), (1142, 18224), (2144, 9707), (2278, 9136), (2284, 9112), (4556, 4568)]