20920934 has 4 divisors (see below), whose sum is σ = 31381404. Its totient is φ = 10460466.

The previous prime is 20920927. The next prime is 20920943. The reversal of 20920934 is 43902902.

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

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 20920897 and 20920906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5230232 + ... + 5230235.

It is an arithmetic number, because the mean of its divisors is an integer number (7845351).

Almost surely, 2^20920934 is an apocalyptic number.

20920934 is a deficient number, since it is larger than the sum of its proper divisors (10460470).

20920934 is a wasteful number, since it uses less digits than its factorization.

20920934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10460469.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20920934 is about 4573.9407516932. The cubic root of 20920934 is about 275.5457328151.

The spelling of 20920934 in words is "twenty million, nine hundred twenty thousand, nine hundred thirty-four".