20572771626 has 144 divisors (see below), whose sum is σ = 51721444320. Its totient is φ = 5889153600.

The previous prime is 20572771603. The next prime is 20572771627. The reversal of 20572771626 is 62617727502.

20572771626 is a `hidden beast` number, since 2 + 0 + 572 + 7 + 71 + 6 + 2 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (20572771627) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 25366761 + ... + 25367571.

Almost surely, 2^20572771626 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20572771626, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25860722160).

20572771626 is an abundant number, since it is smaller than the sum of its proper divisors (31148672694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20572771626 is a wasteful number, since it uses less digits than its factorization.

20572771626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473 (or 1459 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 20572771626 in words is "twenty billion, five hundred seventy-two million, seven hundred seventy-one thousand, six hundred twenty-six".