20423423444 has 12 divisors (see below), whose sum is σ = 35980864500. Its totient is φ = 10143176448.

The previous prime is 20423423401. The next prime is 20423423477. The reversal of 20423423444 is 44432432402.

It can be written as a sum of positive squares in 2 ways, for example, as 7572480400 + 12850943044 = 87020^2 + 113362^2 .

It is a super-2 number, since 2×20423423444² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20423423444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17133149 + ... + 17134340.

It is an arithmetic number, because the mean of its divisors is an integer number (2998405375).

Almost surely, 2^20423423444 is an apocalyptic number.

It is an amenable number.

20423423444 is a deficient number, since it is larger than the sum of its proper divisors (15557441056).

20423423444 is a wasteful number, since it uses less digits than its factorization.

20423423444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34267642 (or 34267640 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 32.

Adding to 20423423444 its reverse (44432432402), we get a palindrome (64855855846).

The spelling of 20423423444 in words is "twenty billion, four hundred twenty-three million, four hundred twenty-three thousand, four hundred forty-four".