20436720435 has 48 divisors (see below), whose sum is σ = 37303437600. Its totient is φ = 10321661952.

The previous prime is 20436720431. The next prime is 20436720461. The reversal of 20436720435 is 53402763402.

It is not a de Polignac number, because 20436720435 - 2² = 20436720431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20436720435.

It is not an unprimeable number, because it can be changed into a prime (20436720431) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3664309 + ... + 3669881.

It is an arithmetic number, because the mean of its divisors is an integer number (777154950).

Almost surely, 2^20436720435 is an apocalyptic number.

20436720435 is a deficient number, since it is larger than the sum of its proper divisors (16866717165).

20436720435 is a wasteful number, since it uses less digits than its factorization.

20436720435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9892 (or 9889 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 36.

The spelling of 20436720435 in words is "twenty billion, four hundred thirty-six million, seven hundred twenty thousand, four hundred thirty-five".