20156220604 has 24 divisors (see below), whose sum is σ = 39986026640. Its totient is φ = 8813245824.

The previous prime is 20156220593. The next prime is 20156220649. The reversal of 20156220604 is 40602265102.

It is a super-2 number, since 2×20156220604² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10199529 + ... + 10201504.

Almost surely, 2^20156220604 is an apocalyptic number.

It is an amenable number.

20156220604 is a deficient number, since it is larger than the sum of its proper divisors (19829806036).

20156220604 is a wasteful number, since it uses less digits than its factorization.

20156220604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20401069 (or 20401067 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 20156220604 its reverse (40602265102), we get a palindrome (60758485706).

The spelling of 20156220604 in words is "twenty billion, one hundred fifty-six million, two hundred twenty thousand, six hundred four".