21811840

素因数分解:

$2^7\times 5^1\times {\mathrm{173}}^1\times {\mathrm{197}}^1$

素因数の和:389

約数の個数: 64

約数和(自身を含む): 52711560

約数和(自身を除く): 30899720

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 173, 197, 320, 346, 394, 640, 692, 788, 865, 985, 1384, 1576, 1730, 1970, 2768, 3152, 3460, 3940, 5536, 6304, 6920, 7880, 11072, 12608, 13840, 15760, 22144, 25216, 27680, 31520, 34081, 55360, 63040, 68162, 110720, 126080, 136324, 170405, 272648, 340810, 545296, 681620, 1090592, 1363240, 2181184, 2726480, 4362368, 5452960, 10905920, 21811840]

約数ペア:

[(1, 21811840), (2, 10905920), (4, 5452960), (5, 4362368), (8, 2726480), (10, 2181184), (16, 1363240), (20, 1090592), (32, 681620), (40, 545296), (64, 340810), (80, 272648), (128, 170405), (160, 136324), (173, 126080), (197, 110720), (320, 68162), (346, 63040), (394, 55360), (640, 34081), (692, 31520), (788, 27680), (865, 25216), (985, 22144), (1384, 15760), (1576, 13840), (1730, 12608), (1970, 11072), (2768, 7880), (3152, 6920), (3460, 6304), (3940, 5536)]