19945984

素因数分解:

$2^9\times {\mathrm{163}}^1\times {\mathrm{239}}^1$

素因数の和:420

約数の個数: 40

約数和(自身を含む): 40265280

約数和(自身を除く): 20319296

約数列:

[1, 2, 4, 8, 16, 32, 64, 128, 163, 239, 256, 326, 478, 512, 652, 956, 1304, 1912, 2608, 3824, 5216, 7648, 10432, 15296, 20864, 30592, 38957, 41728, 61184, 77914, 83456, 122368, 155828, 311656, 623312, 1246624, 2493248, 4986496, 9972992, 19945984]

約数ペア:

[(1, 19945984), (2, 9972992), (4, 4986496), (8, 2493248), (16, 1246624), (32, 623312), (64, 311656), (128, 155828), (163, 122368), (239, 83456), (256, 77914), (326, 61184), (478, 41728), (512, 38957), (652, 30592), (956, 20864), (1304, 15296), (1912, 10432), (2608, 7648), (3824, 5216)]