21489520

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20663}}^1$

素因数の和:20689

約数の個数: 40

約数和(自身を含む): 53809056

約数和(自身を除く): 32319536

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20663, 41326, 82652, 103315, 165304, 206630, 268619, 330608, 413260, 537238, 826520, 1074476, 1343095, 1653040, 2148952, 2686190, 4297904, 5372380, 10744760, 21489520]

約数ペア:

[(1, 21489520), (2, 10744760), (4, 5372380), (5, 4297904), (8, 2686190), (10, 2148952), (13, 1653040), (16, 1343095), (20, 1074476), (26, 826520), (40, 537238), (52, 413260), (65, 330608), (80, 268619), (104, 206630), (130, 165304), (208, 103315), (260, 82652), (520, 41326), (1040, 20663)]