20870890 has 32 divisors (see below), whose sum is σ = 39626496. Its totient is φ = 7898880.

The previous prime is 20870887. The next prime is 20870909. The reversal of 20870890 is 9807802.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23250 + ... + 24130.

It is an arithmetic number, because the mean of its divisors is an integer number (1238328).

Almost surely, 2^20870890 is an apocalyptic number.

20870890 is a deficient number, since it is larger than the sum of its proper divisors (18755606).

20870890 is a wasteful number, since it uses less digits than its factorization.

20870890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 20870890 is about 4568.4669200947. The cubic root of 20870890 is about 275.3258506579.

The spelling of 20870890 in words is "twenty million, eight hundred seventy thousand, eight hundred ninety".