20122775247 has 4 divisors (see below), whose sum is σ = 26830367000. Its totient is φ = 13415183496.

The previous prime is 20122775209. The next prime is 20122775269. The reversal of 20122775247 is 74257722102.

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

It is not a de Polignac number, because 20122775247 - 2¹⁰ = 20122774223 is a prime.

It is a super-2 number, since 2×20122775247² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122775047) 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, 3353795872 + ... + 3353795877.

It is an arithmetic number, because the mean of its divisors is an integer number (6707591750).

Almost surely, 2^20122775247 is an apocalyptic number.

20122775247 is a deficient number, since it is larger than the sum of its proper divisors (6707591753).

20122775247 is an equidigital number, since it uses as much as digits as its factorization.

20122775247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707591752.

The product of its (nonzero) digits is 109760, while the sum is 39.

The spelling of 20122775247 in words is "twenty billion, one hundred twenty-two million, seven hundred seventy-five thousand, two hundred forty-seven".