21337820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{173}}^1\times {\mathrm{881}}^1$

素因数の和:1070

約数の個数: 48

約数和(自身を含む): 51565248

約数和(自身を除く): 30227428

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 173, 346, 692, 865, 881, 1211, 1730, 1762, 2422, 3460, 3524, 4405, 4844, 6055, 6167, 8810, 12110, 12334, 17620, 24220, 24668, 30835, 61670, 123340, 152413, 304826, 609652, 762065, 1066891, 1524130, 2133782, 3048260, 4267564, 5334455, 10668910, 21337820]

約数ペア:

[(1, 21337820), (2, 10668910), (4, 5334455), (5, 4267564), (7, 3048260), (10, 2133782), (14, 1524130), (20, 1066891), (28, 762065), (35, 609652), (70, 304826), (140, 152413), (173, 123340), (346, 61670), (692, 30835), (865, 24668), (881, 24220), (1211, 17620), (1730, 12334), (1762, 12110), (2422, 8810), (3460, 6167), (3524, 6055), (4405, 4844)]