20892561 has 8 divisors (see below), whose sum is σ = 28313664. Its totient is φ = 13699920.

The previous prime is 20892559. The next prime is 20892569. The reversal of 20892561 is 16529802.

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

It is not a de Polignac number, because 20892561 - 2¹ = 20892559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20892569) 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, 56901 + ... + 57266.

It is an arithmetic number, because the mean of its divisors is an integer number (3539208).

Almost surely, 2^20892561 is an apocalyptic number.

It is an amenable number.

20892561 is a deficient number, since it is larger than the sum of its proper divisors (7421103).

20892561 is a wasteful number, since it uses less digits than its factorization.

20892561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114231.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 20892561 is about 4570.8381069559. The cubic root of 20892561 is about 275.4211112911.

The spelling of 20892561 in words is "twenty million, eight hundred ninety-two thousand, five hundred sixty-one".