20120245177 has 4 divisors (see below), whose sum is σ = 20769285376. Its totient is φ = 19471204980.

The previous prime is 20120245169. The next prime is 20120245183. The reversal of 20120245177 is 77154202102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77154202102 = 2 ⋅38577101051.

It is a cyclic number.

It is not a de Polignac number, because 20120245177 - 2³ = 20120245169 is a prime.

It is a super-2 number, since 2×20120245177² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 649040167 = 20120245177 / (2 + 0 + 1 + 2 + 0 + 2 + 4 + 5 + 1 + 7 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20120245147) 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, 324520053 + ... + 324520114.

It is an arithmetic number, because the mean of its divisors is an integer number (5192321344).

Almost surely, 2^20120245177 is an apocalyptic number.

It is an amenable number.

20120245177 is a deficient number, since it is larger than the sum of its proper divisors (649040199).

20120245177 is an equidigital number, since it uses as much as digits as its factorization.

20120245177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649040198.

The product of its (nonzero) digits is 7840, while the sum is 31.

Adding to 20120245177 its reverse (77154202102), we get a palindrome (97274447279).

The spelling of 20120245177 in words is "twenty billion, one hundred twenty million, two hundred forty-five thousand, one hundred seventy-seven".