20016156621 has 16 divisors (see below), whose sum is σ = 26899043904. Its totient is φ = 13238803584.

The previous prime is 20016156619. The next prime is 20016156623. The reversal of 20016156621 is 12665161002.

It is an interprime number because it is at equal distance from previous prime (20016156619) and next prime (20016156623).

It is not a de Polignac number, because 20016156621 - 2¹ = 20016156619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20016156623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720831 + ... + 748083.

It is an arithmetic number, because the mean of its divisors is an integer number (1681190244).

Almost surely, 2^20016156621 is an apocalyptic number.

It is an amenable number.

20016156621 is a deficient number, since it is larger than the sum of its proper divisors (6882887283).

20016156621 is a wasteful number, since it uses less digits than its factorization.

20016156621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29180.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 20016156621 in words is "twenty billion, sixteen million, one hundred fifty-six thousand, six hundred twenty-one".