20870492 has 12 divisors (see below), whose sum is σ = 38671920. Its totient is φ = 9821376.

The previous prime is 20870489. The next prime is 20870497. The reversal of 20870492 is 29407802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870497) 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, 153392 + ... + 153527.

It is an arithmetic number, because the mean of its divisors is an integer number (3222660).

Almost surely, 2^20870492 is an apocalyptic number.

It is an amenable number.

20870492 is a deficient number, since it is larger than the sum of its proper divisors (17801428).

20870492 is a wasteful number, since it uses less digits than its factorization.

20870492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306940 (or 306938 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20870492 is about 4568.4233604166. The cubic root of 20870492 is about 275.3241005267.

The spelling of 20870492 in words is "twenty million, eight hundred seventy thousand, four hundred ninety-two".