20572542 has 60 divisors (see below), whose sum is σ = 48058296. Its totient is φ = 6577200.

The previous prime is 20572537. The next prime is 20572543. The reversal of 20572542 is 24527502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572543) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 136167 + ... + 136317.

Almost surely, 2^20572542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20572542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24029148).

20572542 is an abundant number, since it is smaller than the sum of its proper divisors (27485754).

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

20572542 is a wasteful number, since it uses less digits than its factorization.

20572542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 20572542 is about 4535.6964184125. The cubic root of 20572542 is about 274.0076276137.

The spelling of 20572542 in words is "twenty million, five hundred seventy-two thousand, five hundred forty-two".