19801984

素因数分解:

$2^7\times {\mathrm{67}}^1\times {\mathrm{2309}}^1$

素因数の和:2390

約数の個数: 32

約数和(自身を含む): 40055400

約数和(自身を除く): 20253416

約数列:

[1, 2, 4, 8, 16, 32, 64, 67, 128, 134, 268, 536, 1072, 2144, 2309, 4288, 4618, 8576, 9236, 18472, 36944, 73888, 147776, 154703, 295552, 309406, 618812, 1237624, 2475248, 4950496, 9900992, 19801984]

約数ペア:

[(1, 19801984), (2, 9900992), (4, 4950496), (8, 2475248), (16, 1237624), (32, 618812), (64, 309406), (67, 295552), (128, 154703), (134, 147776), (268, 73888), (536, 36944), (1072, 18472), (2144, 9236), (2309, 8576), (4288, 4618)]