20542131 has 6 divisors (see below), whose sum is σ = 29671980. Its totient is φ = 13694748.

The previous prime is 20542099. The next prime is 20542153. The reversal of 20542131 is 13124502.

It is not a de Polignac number, because 20542131 - 2⁵ = 20542099 is a prime.

It is a super-2 number, since 2×20542131² = 843958292042322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20542331) 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, 1141221 + ... + 1141238.

It is an arithmetic number, because the mean of its divisors is an integer number (4945330).

Almost surely, 2^20542131 is an apocalyptic number.

20542131 is a deficient number, since it is larger than the sum of its proper divisors (9129849).

20542131 is a wasteful number, since it uses less digits than its factorization.

20542131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282465 (or 2282462 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20542131 is about 4532.3427716800. The cubic root of 20542131 is about 273.8725453715.

Adding to 20542131 its reverse (13124502), we get a palindrome (33666633).

The spelling of 20542131 in words is "twenty million, five hundred forty-two thousand, one hundred thirty-one".