20432121023 has 4 divisors (see below), whose sum is σ = 20432809488. Its totient is φ = 20431432560.

The previous prime is 20432120941. The next prime is 20432121079. The reversal of 20432121023 is 32012123402.

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 20432121023 - 2⁸ = 20432120767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20432120986 and 20432121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20432121223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297611 + ... + 359772.

It is an arithmetic number, because the mean of its divisors is an integer number (5108202372).

Almost surely, 2^20432121023 is an apocalyptic number.

20432121023 is a deficient number, since it is larger than the sum of its proper divisors (688465).

20432121023 is an equidigital number, since it uses as much as digits as its factorization.

20432121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688464.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20432121023 its reverse (32012123402), we get a palindrome (52444244425).

The spelling of 20432121023 in words is "twenty billion, four hundred thirty-two million, one hundred twenty-one thousand, twenty-three".