20212542 has 48 divisors (see below), whose sum is σ = 52690560. Its totient is φ = 5470416.

The previous prime is 20212531. The next prime is 20212547. The reversal of 20212542 is 24521202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1828 + ... + 6615.

It is an arithmetic number, because the mean of its divisors is an integer number (1097720).

Almost surely, 2^20212542 is an apocalyptic number.

20212542 is an abundant number, since it is smaller than the sum of its proper divisors (32478018).

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

20212542 is a wasteful number, since it uses less digits than its factorization.

20212542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8477 (or 8474 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 20212542 is about 4495.8360735240. The cubic root of 20212542 is about 272.3999217269.

Adding to 20212542 its reverse (24521202), we get a palindrome (44733744).

The spelling of 20212542 in words is "twenty million, two hundred twelve thousand, five hundred forty-two".