20034891 has 16 divisors (see below), whose sum is σ = 31428000. Its totient is φ = 12570624.

The previous prime is 20034887. The next prime is 20034893. The reversal of 20034891 is 19843002.

It is not a de Polignac number, because 20034891 - 2² = 20034887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20034893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21366 + ... + 22283.

It is an arithmetic number, because the mean of its divisors is an integer number (1964250).

Almost surely, 2^20034891 is an apocalyptic number.

20034891 is a deficient number, since it is larger than the sum of its proper divisors (11393109).

20034891 is a wasteful number, since it uses less digits than its factorization.

20034891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43675 (or 43669 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20034891 is about 4476.0351875292. The cubic root of 20034891 is about 271.5995178656.

Adding to 20034891 its reverse (19843002), we get a palindrome (39877893).

The spelling of 20034891 in words is "twenty million, thirty-four thousand, eight hundred ninety-one".