20534990 has 16 divisors (see below), whose sum is σ = 42243552. Its totient is φ = 7040544.

The previous prime is 20534981. The next prime is 20534999. The reversal of 20534990 is 9943502.

It is an interprime number because it is at equal distance from previous prime (20534981) and next prime (20534999).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146609 + ... + 146748.

It is an arithmetic number, because the mean of its divisors is an integer number (2640222).

Almost surely, 2^20534990 is an apocalyptic number.

20534990 is an abundant number, since it is smaller than the sum of its proper divisors (21708562).

20534990 is a wasteful number, since it uses less digits than its factorization.

20534990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293371.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 20534990 is about 4531.5549207750. The cubic root of 20534990 is about 273.8408065269.

The spelling of 20534990 in words is "twenty million, five hundred thirty-four thousand, nine hundred ninety".