20440911824 has 10 divisors (see below), whose sum is σ = 39604266690. Its totient is φ = 10220455904.

The previous prime is 20440911823. The next prime is 20440911833. The reversal of 20440911824 is 42811904402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13892865424 + 6548046400 = 117868^2 + 80920^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440911823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638778479 + ... + 638778510.

It is an arithmetic number, because the mean of its divisors is an integer number (3960426669).

Almost surely, 2^20440911824 is an apocalyptic number.

It is an amenable number.

20440911824 is a deficient number, since it is larger than the sum of its proper divisors (19163354866).

20440911824 is a wasteful number, since it uses less digits than its factorization.

20440911824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277556997 (or 1277556991 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The spelling of 20440911824 in words is "twenty billion, four hundred forty million, nine hundred eleven thousand, eight hundred twenty-four".