20657043 has 12 divisors (see below), whose sum is σ = 32550648. Its totient is φ = 12519360.

The previous prime is 20657041. The next prime is 20657051. The reversal of 20657043 is 34075602.

It is a happy number.

20657043 is a `hidden beast` number, since 2 + 0 + 657 + 0 + 4 + 3 = 666.

It is not a de Polignac number, because 20657043 - 2¹ = 20657041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20656998 and 20657016.

It is not an unprimeable number, because it can be changed into a prime (20657041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104230 + ... + 104427.

It is an arithmetic number, because the mean of its divisors is an integer number (2712554).

Almost surely, 2^20657043 is an apocalyptic number.

20657043 is a deficient number, since it is larger than the sum of its proper divisors (11893605).

20657043 is a wasteful number, since it uses less digits than its factorization.

20657043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208674 (or 208671 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20657043 is about 4545.0019801976. The cubic root of 20657043 is about 274.3822740620.

The spelling of 20657043 in words is "twenty million, six hundred fifty-seven thousand, forty-three".