20550021885 has 12 divisors (see below), whose sum is σ = 35620038012. Its totient is φ = 10960011648.

The previous prime is 20550021859. The next prime is 20550021929. The reversal of 20550021885 is 58812005502.

20550021885 is a `hidden beast` number, since 2 + 0 + 550 + 0 + 21 + 8 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15068544516 + 5481477369 = 122754^2 + 74037^2 .

It is not a de Polignac number, because 20550021885 - 2⁸ = 20550021629 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228333532 + ... + 228333621.

It is an arithmetic number, because the mean of its divisors is an integer number (2968336501).

Almost surely, 2^20550021885 is an apocalyptic number.

It is an amenable number.

20550021885 is a deficient number, since it is larger than the sum of its proper divisors (15070016127).

20550021885 is a wasteful number, since it uses less digits than its factorization.

20550021885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456667164 (or 456667161 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The spelling of 20550021885 in words is "twenty billion, five hundred fifty million, twenty-one thousand, eight hundred eighty-five".