20008215277 has 4 divisors (see below), whose sum is σ = 20034099900. Its totient is φ = 19982330656.

The previous prime is 20008215257. The next prime is 20008215289. The reversal of 20008215277 is 77251280002.

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 4460369796 + 15547845481 = 66786^2 + 124691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20008215277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20008215247) 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, 12941152 + ... + 12942697.

It is an arithmetic number, because the mean of its divisors is an integer number (5008524975).

Almost surely, 2^20008215277 is an apocalyptic number.

It is an amenable number.

20008215277 is a deficient number, since it is larger than the sum of its proper divisors (25884623).

20008215277 is an equidigital number, since it uses as much as digits as its factorization.

20008215277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25884622.

The product of its (nonzero) digits is 15680, while the sum is 34.

Adding to 20008215277 its reverse (77251280002), we get a palindrome (97259495279).

The spelling of 20008215277 in words is "twenty billion, eight million, two hundred fifteen thousand, two hundred seventy-seven".