20864553 has 8 divisors (see below), whose sum is σ = 27960000. Its totient is φ = 13839408.

The previous prime is 20864539. The next prime is 20864573. The reversal of 20864553 is 35546802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20864553 - 2⁸ = 20864297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20864513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16878 + ... + 18071.

It is an arithmetic number, because the mean of its divisors is an integer number (3495000).

Almost surely, 2^20864553 is an apocalyptic number.

It is an amenable number.

20864553 is a deficient number, since it is larger than the sum of its proper divisors (7095447).

20864553 is a wasteful number, since it uses less digits than its factorization.

20864553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35151.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 20864553 is about 4567.7733087359. The cubic root of 20864553 is about 275.2979822324.

The spelling of 20864553 in words is "twenty million, eight hundred sixty-four thousand, five hundred fifty-three".