20552987 has 16 divisors (see below), whose sum is σ = 25681152. Its totient is φ = 16014240.

The previous prime is 20552981. The next prime is 20552989. The reversal of 20552987 is 78925502.

It is a cyclic number.

It is not a de Polignac number, because 20552987 - 2⁴ = 20552971 is a prime.

It is a super-3 number, since 3×20552987³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20552987.

It is not an unprimeable number, because it can be changed into a prime (20552981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4412 + ... + 7782.

It is an arithmetic number, because the mean of its divisors is an integer number (1605072).

Almost surely, 2^20552987 is an apocalyptic number.

20552987 is a deficient number, since it is larger than the sum of its proper divisors (5128165).

20552987 is a wasteful number, since it uses less digits than its factorization.

20552987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3458.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 20552987 is about 4533.5402281219. The cubic root of 20552987 is about 273.9207817945.

The spelling of 20552987 in words is "twenty million, five hundred fifty-two thousand, nine hundred eighty-seven".