20420341231 has 4 divisors (see below), whose sum is σ = 21621537792. Its totient is φ = 19219144672.

The previous prime is 20420341217. The next prime is 20420341243. The reversal of 20420341231 is 13214302402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20420341231 - 2⁵ = 20420341199 is a prime.

It is a super-2 number, since 2×20420341231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420342231) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 600598255 + ... + 600598288.

It is an arithmetic number, because the mean of its divisors is an integer number (5405384448).

Almost surely, 2^20420341231 is an apocalyptic number.

20420341231 is a deficient number, since it is larger than the sum of its proper divisors (1201196561).

20420341231 is a wasteful number, since it uses less digits than its factorization.

20420341231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201196560.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20420341231 its reverse (13214302402), we get a palindrome (33634643633).

The spelling of 20420341231 in words is "twenty billion, four hundred twenty million, three hundred forty-one thousand, two hundred thirty-one".