20683457 has 4 divisors (see below), whose sum is σ = 21772080. Its totient is φ = 19594836.

The previous prime is 20683447. The next prime is 20683471. The reversal of 20683457 is 75438602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20683457 - 2¹⁶ = 20617921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20683447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544283 + ... + 544320.

It is an arithmetic number, because the mean of its divisors is an integer number (5443020).

Almost surely, 2^20683457 is an apocalyptic number.

It is an amenable number.

20683457 is a deficient number, since it is larger than the sum of its proper divisors (1088623).

20683457 is a wasteful number, since it uses less digits than its factorization.

20683457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088622.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20683457 is about 4547.9068811927. The cubic root of 20683457 is about 274.4991744086.

The spelling of 20683457 in words is "twenty million, six hundred eighty-three thousand, four hundred fifty-seven".