20434420544 has 14 divisors (see below), whose sum is σ = 40549553394. Its totient is φ = 10217210240.

The previous prime is 20434420543. The next prime is 20434420577. The reversal of 20434420544 is 44502443402.

It can be written as a sum of positive squares in only one way, i.e., 15825640000 + 4608780544 = 125800^2 + 67888^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 20434420544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434420543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159643847 + ... + 159643974.

It is an arithmetic number, because the mean of its divisors is an integer number (2896396671).

Almost surely, 2^20434420544 is an apocalyptic number.

It is an amenable number.

20434420544 is a deficient number, since it is larger than the sum of its proper divisors (20115132850).

20434420544 is an equidigital number, since it uses as much as digits as its factorization.

20434420544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319287833 (or 319287823 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 32.

Adding to 20434420544 its reverse (44502443402), we get a palindrome (64936863946).

The spelling of 20434420544 in words is "twenty billion, four hundred thirty-four million, four hundred twenty thousand, five hundred forty-four".