20366771621 has 32 divisors (see below), whose sum is σ = 23995595520. Its totient is φ = 16927432704.

The previous prime is 20366771617. The next prime is 20366771629. The reversal of 20366771621 is 12617766302.

It is not a de Polignac number, because 20366771621 - 2² = 20366771617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20366771629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10872941 + ... + 10874813.

It is an arithmetic number, because the mean of its divisors is an integer number (749862360).

Almost surely, 2^20366771621 is an apocalyptic number.

It is an amenable number.

20366771621 is a deficient number, since it is larger than the sum of its proper divisors (3628823899).

20366771621 is a wasteful number, since it uses less digits than its factorization.

20366771621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 20366771621 in words is "twenty billion, three hundred sixty-six million, seven hundred seventy-one thousand, six hundred twenty-one".