21515018

素因数分解:

$2^1\times 7^3\times {\mathrm{79}}^1\times {\mathrm{397}}^1$

素因数の和:499

約数の個数: 32

約数和(自身を含む): 38208000

約数和(自身を除く): 16692982

約数列:

[1, 2, 7, 14, 49, 79, 98, 158, 343, 397, 553, 686, 794, 1106, 2779, 3871, 5558, 7742, 19453, 27097, 31363, 38906, 54194, 62726, 136171, 219541, 272342, 439082, 1536787, 3073574, 10757509, 21515018]

約数ペア:

[(1, 21515018), (2, 10757509), (7, 3073574), (14, 1536787), (49, 439082), (79, 272342), (98, 219541), (158, 136171), (343, 62726), (397, 54194), (553, 38906), (686, 31363), (794, 27097), (1106, 19453), (2779, 7742), (3871, 5558)]