20111404434 has 96 divisors (see below), whose sum is σ = 45273489408. Its totient is φ = 5948738400.

The previous prime is 20111404429. The next prime is 20111404477. The reversal of 20111404434 is 43440411102.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20711569 + ... + 20712539.

It is an arithmetic number, because the mean of its divisors is an integer number (471598848).

Almost surely, 2^20111404434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111404434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22636744704).

20111404434 is an abundant number, since it is smaller than the sum of its proper divisors (25162084974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111404434 is a wasteful number, since it uses less digits than its factorization.

20111404434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652 (or 1641 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 20111404434 its reverse (43440411102), we get a palindrome (63551815536).

The spelling of 20111404434 in words is "twenty billion, one hundred eleven million, four hundred four thousand, four hundred thirty-four".