20657026 has 32 divisors (see below), whose sum is σ = 34760880. Its totient is φ = 9144576.

The previous prime is 20656991. The next prime is 20657027. The reversal of 20657026 is 62075602.

It is a Cunningham number, because it is equal to 4545²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 18481401 + 2175625 = 4299^2 + 1475^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20656985 and 20657003.

It is not an unprimeable number, because it can be changed into a prime (20657027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104760 + ... + 104956.

Almost surely, 2^20657026 is an apocalyptic number.

20657026 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20657026 is a deficient number, since it is larger than the sum of its proper divisors (14103854).

20657026 is a wasteful number, since it uses less digits than its factorization.

20657026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20657026 is about 4545.0001100110. Note that the first 3 decimals coincide. The cubic root of 20657026 is about 274.3821987931.

The spelling of 20657026 in words is "twenty million, six hundred fifty-seven thousand, twenty-six".