20848640

素因数分解:

$2^{13}\times 5^1\times {\mathrm{509}}^1$

素因数の和:540

約数の個数: 56

約数和(自身を含む): 50131980

約数和(自身を除く): 29283340

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 509, 512, 640, 1018, 1024, 1280, 2036, 2048, 2545, 2560, 4072, 4096, 5090, 5120, 8144, 8192, 10180, 10240, 16288, 20360, 20480, 32576, 40720, 40960, 65152, 81440, 130304, 162880, 260608, 325760, 521216, 651520, 1042432, 1303040, 2084864, 2606080, 4169728, 5212160, 10424320, 20848640]

約数ペア:

[(1, 20848640), (2, 10424320), (4, 5212160), (5, 4169728), (8, 2606080), (10, 2084864), (16, 1303040), (20, 1042432), (32, 651520), (40, 521216), (64, 325760), (80, 260608), (128, 162880), (160, 130304), (256, 81440), (320, 65152), (509, 40960), (512, 40720), (640, 32576), (1018, 20480), (1024, 20360), (1280, 16288), (2036, 10240), (2048, 10180), (2545, 8192), (2560, 8144), (4072, 5120), (4096, 5090)]