20657426 has 8 divisors (see below), whose sum is σ = 31079100. Its totient is φ = 10297728.

The previous prime is 20657423. The next prime is 20657437. The reversal of 20657426 is 62475602.

It can be written as a sum of positive squares in 2 ways, for example, as 16851025 + 3806401 = 4105^2 + 1951^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20657392 and 20657401.

It is not an unprimeable number, because it can be changed into a prime (20657423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14651 + ... + 15998.

Almost surely, 2^20657426 is an apocalyptic number.

20657426 is a deficient number, since it is larger than the sum of its proper divisors (10421674).

20657426 is a wasteful number, since it uses less digits than its factorization.

20657426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30988.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20657426 is about 4545.0441141974. The cubic root of 20657426 is about 274.3839698155.

The spelling of 20657426 in words is "twenty million, six hundred fifty-seven thousand, four hundred twenty-six".