20552897287 has 16 divisors (see below), whose sum is σ = 22479648352. Its totient is φ = 18675930240.

The previous prime is 20552897263. The next prime is 20552897363. The reversal of 20552897287 is 78279825502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20552897287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20552897207) 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, 1404613 + ... + 1419169.

It is an arithmetic number, because the mean of its divisors is an integer number (1404978022).

Almost surely, 2^20552897287 is an apocalyptic number.

20552897287 is a deficient number, since it is larger than the sum of its proper divisors (1926751065).

20552897287 is a wasteful number, since it uses less digits than its factorization.

20552897287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16258.

The product of its (nonzero) digits is 5644800, while the sum is 55.

The spelling of 20552897287 in words is "twenty billion, five hundred fifty-two million, eight hundred ninety-seven thousand, two hundred eighty-seven".