20629939 has 4 divisors (see below), whose sum is σ = 22505400. Its totient is φ = 18754480.

The previous prime is 20629913. The next prime is 20629943. The reversal of 20629939 is 93992602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20629939 - 2⁵ = 20629907 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20629909) 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, 937714 + ... + 937735.

It is an arithmetic number, because the mean of its divisors is an integer number (5626350).

Almost surely, 2^20629939 is an apocalyptic number.

20629939 is a deficient number, since it is larger than the sum of its proper divisors (1875461).

20629939 is a wasteful number, since it uses less digits than its factorization.

20629939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875460.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 20629939 is about 4542.0192646003. The cubic root of 20629939 is about 274.2622163469.

The spelling of 20629939 in words is "twenty million, six hundred twenty-nine thousand, nine hundred thirty-nine".