20941520

素因数分解:

$2^4\times 5^1\times {\mathrm{67}}^1\times {\mathrm{3907}}^1$

素因数の和:3987

約数の個数: 40

約数和(自身を含む): 49428384

約数和(自身を除く): 28486864

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 67, 80, 134, 268, 335, 536, 670, 1072, 1340, 2680, 3907, 5360, 7814, 15628, 19535, 31256, 39070, 62512, 78140, 156280, 261769, 312560, 523538, 1047076, 1308845, 2094152, 2617690, 4188304, 5235380, 10470760, 20941520]

約数ペア:

[(1, 20941520), (2, 10470760), (4, 5235380), (5, 4188304), (8, 2617690), (10, 2094152), (16, 1308845), (20, 1047076), (40, 523538), (67, 312560), (80, 261769), (134, 156280), (268, 78140), (335, 62512), (536, 39070), (670, 31256), (1072, 19535), (1340, 15628), (2680, 7814), (3907, 5360)]