20156222667 has 24 divisors (see below), whose sum is σ = 32025227472. Its totient is φ = 11236915200.

The previous prime is 20156222633. The next prime is 20156222689. The reversal of 20156222667 is 76622265102.

It is not a de Polignac number, because 20156222667 - 2¹⁴ = 20156206283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20156222617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1666134 + ... + 1678187.

It is an arithmetic number, because the mean of its divisors is an integer number (1334384478).

Almost surely, 2^20156222667 is an apocalyptic number.

20156222667 is a deficient number, since it is larger than the sum of its proper divisors (11869004805).

20156222667 is a wasteful number, since it uses less digits than its factorization.

20156222667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344379 (or 3344372 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

Adding to 20156222667 its reverse (76622265102), we get a palindrome (96778487769).

The spelling of 20156222667 in words is "twenty billion, one hundred fifty-six million, two hundred twenty-two thousand, six hundred sixty-seven".