20770147505 has 4 divisors (see below), whose sum is σ = 24924177012. Its totient is φ = 16616118000.

The previous prime is 20770147501. The next prime is 20770147513. The reversal of 20770147505 is 50574107702.

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 10894558129 + 9875589376 = 104377^2 + 99376^2 .

It is not a de Polignac number, because 20770147505 - 2² = 20770147501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20770147501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2077014746 + ... + 2077014755.

It is an arithmetic number, because the mean of its divisors is an integer number (6231044253).

Almost surely, 2^20770147505 is an apocalyptic number.

It is an amenable number.

20770147505 is a deficient number, since it is larger than the sum of its proper divisors (4154029507).

20770147505 is an equidigital number, since it uses as much as digits as its factorization.

20770147505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4154029506.

The product of its (nonzero) digits is 68600, while the sum is 38.

The spelling of 20770147505 in words is "twenty billion, seven hundred seventy million, one hundred forty-seven thousand, five hundred five".