20500542 has 12 divisors (see below), whose sum is σ = 44417880. Its totient is φ = 6833508.

The previous prime is 20500541. The next prime is 20500577. The reversal of 20500542 is 24500502.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1138919 = 20500542 / (2 + 0 + 5 + 0 + 0 + 5 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 569442 + ... + 569477.

It is an arithmetic number, because the mean of its divisors is an integer number (3701490).

Almost surely, 2^20500542 is an apocalyptic number.

20500542 is an abundant number, since it is smaller than the sum of its proper divisors (23917338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20500542 is a wasteful number, since it uses less digits than its factorization.

20500542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138927 (or 1138924 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20500542 is about 4527.7524225602. The cubic root of 20500542 is about 273.6875957084.

The spelling of 20500542 in words is "twenty million, five hundred thousand, five hundred forty-two".