20870844 has 24 divisors (see below), whose sum is σ = 50816640. Its totient is φ = 6654384.

The previous prime is 20870813. The next prime is 20870869. The reversal of 20870844 is 44807802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37534 + ... + 38085.

It is an arithmetic number, because the mean of its divisors is an integer number (2117360).

Almost surely, 2^20870844 is an apocalyptic number.

It is an amenable number.

20870844 is an abundant number, since it is smaller than the sum of its proper divisors (29945796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20870844 is a wasteful number, since it uses less digits than its factorization.

20870844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75649 (or 75647 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 20870844 is about 4568.4618855803. The cubic root of 20870844 is about 275.3256483826.

The spelling of 20870844 in words is "twenty million, eight hundred seventy thousand, eight hundred forty-four".