20646039 has 8 divisors (see below), whose sum is σ = 27682560. Its totient is φ = 13686776.

The previous prime is 20646029. The next prime is 20646049. The reversal of 20646039 is 93064602.

It is an interprime number because it is at equal distance from previous prime (20646029) and next prime (20646049).

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

It is a cyclic number.

It is not a de Polignac number, because 20646039 - 2¹⁶ = 20580503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20645997 and 20646015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18687 + ... + 19760.

It is an arithmetic number, because the mean of its divisors is an integer number (3460320).

Almost surely, 2^20646039 is an apocalyptic number.

20646039 is a deficient number, since it is larger than the sum of its proper divisors (7036521).

20646039 is a wasteful number, since it uses less digits than its factorization.

20646039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38629.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 20646039 is about 4543.7912584097. The cubic root of 20646039 is about 274.3335442925. Note that the first 3 decimals are identical.

The spelling of 20646039 in words is "twenty million, six hundred forty-six thousand, thirty-nine".