20434222331 has 4 divisors (see below), whose sum is σ = 20739210792. Its totient is φ = 20129233872.

The previous prime is 20434222307. The next prime is 20434222357. The reversal of 20434222331 is 13322243402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20434222331 is a prime.

It is a super-2 number, since 2×20434222331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20434222331.

It is not an unprimeable number, because it can be changed into a prime (20434222381) 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, 152494130 + ... + 152494263.

It is an arithmetic number, because the mean of its divisors is an integer number (5184802698).

Almost surely, 2^20434222331 is an apocalyptic number.

20434222331 is a deficient number, since it is larger than the sum of its proper divisors (304988461).

20434222331 is an equidigital number, since it uses as much as digits as its factorization.

20434222331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304988460.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 20434222331 its reverse (13322243402), we get a palindrome (33756465733).

The spelling of 20434222331 in words is "twenty billion, four hundred thirty-four million, two hundred twenty-two thousand, three hundred thirty-one".