20152111434 has 128 divisors (see below), whose sum is σ = 51844423680. Its totient is φ = 5075668224.

The previous prime is 20152111429. The next prime is 20152111439. The reversal of 20152111434 is 43411125102.

It is an interprime number because it is at equal distance from previous prime (20152111429) and next prime (20152111439).

It is a super-2 number, since 2×20152111434² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20152111439) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13926099 + ... + 13927545.

It is an arithmetic number, because the mean of its divisors is an integer number (405034560).

Almost surely, 2^20152111434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20152111434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25922211840).

20152111434 is an abundant number, since it is smaller than the sum of its proper divisors (31692312246).

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

20152111434 is a wasteful number, since it uses less digits than its factorization.

20152111434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 20152111434 its reverse (43411125102), we get a palindrome (63563236536).

The spelling of 20152111434 in words is "twenty billion, one hundred fifty-two million, one hundred eleven thousand, four hundred thirty-four".