19561984

素因数分解:

$2^9\times {\mathrm{13}}^1\times {\mathrm{2939}}^1$

素因数の和:2970

約数の個数: 40

約数和(自身を含む): 42106680

約数和(自身を除く): 22544696

約数列:

[1, 2, 4, 8, 13, 16, 26, 32, 52, 64, 104, 128, 208, 256, 416, 512, 832, 1664, 2939, 3328, 5878, 6656, 11756, 23512, 38207, 47024, 76414, 94048, 152828, 188096, 305656, 376192, 611312, 752384, 1222624, 1504768, 2445248, 4890496, 9780992, 19561984]

約数ペア:

[(1, 19561984), (2, 9780992), (4, 4890496), (8, 2445248), (13, 1504768), (16, 1222624), (26, 752384), (32, 611312), (52, 376192), (64, 305656), (104, 188096), (128, 152828), (208, 94048), (256, 76414), (416, 47024), (512, 38207), (832, 23512), (1664, 11756), (2939, 6656), (3328, 5878)]