20837942 has 4 divisors (see below), whose sum is σ = 31256916. Its totient is φ = 10418970.

The previous prime is 20837899. The next prime is 20837981. The reversal of 20837942 is 24973802.

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

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, 5209484 + ... + 5209487.

It is an arithmetic number, because the mean of its divisors is an integer number (7814229).

Almost surely, 2^20837942 is an apocalyptic number.

20837942 is a deficient number, since it is larger than the sum of its proper divisors (10418974).

20837942 is a wasteful number, since it uses less digits than its factorization.

20837942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10418973.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20837942 is about 4564.8594720977. The cubic root of 20837942 is about 275.1808925546.

The spelling of 20837942 in words is "twenty million, eight hundred thirty-seven thousand, nine hundred forty-two".