20434515077 has 4 divisors (see below), whose sum is σ = 20664116460. Its totient is φ = 20204913696.

The previous prime is 20434515019. The next prime is 20434515097. The reversal of 20434515077 is 77051543402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1323940996 + 19110574081 = 36386^2 + 138241^2 .

It is a cyclic number.

It is not a de Polignac number, because 20434515077 - 2¹⁰ = 20434514053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20434515077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434515097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114800558 + ... + 114800735.

It is an arithmetic number, because the mean of its divisors is an integer number (5166029115).

Almost surely, 2^20434515077 is an apocalyptic number.

It is an amenable number.

20434515077 is a deficient number, since it is larger than the sum of its proper divisors (229601383).

20434515077 is an equidigital number, since it uses as much as digits as its factorization.

20434515077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229601382.

The product of its (nonzero) digits is 117600, while the sum is 38.

The spelling of 20434515077 in words is "twenty billion, four hundred thirty-four million, five hundred fifteen thousand, seventy-seven".