20152434681 has 24 divisors (see below), whose sum is σ = 29185796640. Its totient is φ = 13399598016.

The previous prime is 20152434629. The next prime is 20152434697. The reversal of 20152434681 is 18643425102.

It is a happy number.

20152434681 is a `hidden beast` number, since 2 + 0 + 152 + 43 + 468 + 1 = 666.

It is not a de Polignac number, because 20152434681 - 2²⁶ = 20085325817 is a prime.

It is a super-2 number, since 2×20152434681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20152430681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9645885 + ... + 9647973.

It is an arithmetic number, because the mean of its divisors is an integer number (1216074860).

Almost surely, 2^20152434681 is an apocalyptic number.

It is an amenable number.

20152434681 is a deficient number, since it is larger than the sum of its proper divisors (9033361959).

20152434681 is a wasteful number, since it uses less digits than its factorization.

20152434681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405 (or 4402 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Adding to 20152434681 its reverse (18643425102), we get a palindrome (38795859783).

The spelling of 20152434681 in words is "twenty billion, one hundred fifty-two million, four hundred thirty-four thousand, six hundred eighty-one".