20531212242 has 32 divisors (see below), whose sum is σ = 43709284800. Its totient is φ = 6410688768.

The previous prime is 20531212237. The next prime is 20531212253. The reversal of 20531212242 is 24221213502.

It is a super-2 number, since 2×20531212242² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1001643 + ... + 1021934.

It is an arithmetic number, because the mean of its divisors is an integer number (1365915150).

Almost surely, 2^20531212242 is an apocalyptic number.

20531212242 is an abundant number, since it is smaller than the sum of its proper divisors (23178072558).

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

20531212242 is a wasteful number, since it uses less digits than its factorization.

20531212242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023690.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 20531212242 its reverse (24221213502), we get a palindrome (44752425744).

The spelling of 20531212242 in words is "twenty billion, five hundred thirty-one million, two hundred twelve thousand, two hundred forty-two".