20001885 has 32 divisors (see below), whose sum is σ = 33022080. Its totient is φ = 10334208.

The previous prime is 20001853. The next prime is 20001899. The reversal of 20001885 is 58810002.

It is not a de Polignac number, because 20001885 - 2⁵ = 20001853 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85729 + ... + 85961.

It is an arithmetic number, because the mean of its divisors is an integer number (1031940).

Almost surely, 2^20001885 is an apocalyptic number.

It is an amenable number.

20001885 is a deficient number, since it is larger than the sum of its proper divisors (13020195).

20001885 is a wasteful number, since it uses less digits than its factorization.

20001885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 20001885 is about 4472.3466994409. The cubic root of 20001885 is about 271.4502891869.

Adding to 20001885 its reverse (58810002), we get a palindrome (78811887).

The spelling of 20001885 in words is "twenty million, one thousand, eight hundred eighty-five".