20434536651 has 16 divisors (see below), whose sum is σ = 28782138240. Its totient is φ = 12860084160.

The previous prime is 20434536649. The next prime is 20434536667. The reversal of 20434536651 is 15663543402.

It is not a de Polignac number, because 20434536651 - 2¹ = 20434536649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20434536611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 621885 + ... + 653918.

It is an arithmetic number, because the mean of its divisors is an integer number (1798883640).

Almost surely, 2^20434536651 is an apocalyptic number.

20434536651 is a deficient number, since it is larger than the sum of its proper divisors (8347601589).

20434536651 is a wasteful number, since it uses less digits than its factorization.

20434536651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276106.

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 20434536651 in words is "twenty billion, four hundred thirty-four million, five hundred thirty-six thousand, six hundred fifty-one".