20061600021 has 16 divisors (see below), whose sum is σ = 30224635200. Its totient is φ = 13147714224.

The previous prime is 20061599933. The next prime is 20061600067. The reversal of 20061600021 is 12000616002.

It is a happy number.

20061600021 is a `hidden beast` number, since 2 + 0 + 0 + 61 + 600 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 20061600021 - 2¹¹ = 20061597973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20061599967 and 20061600003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20061600071) 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, 6295206 + ... + 6298391.

It is an arithmetic number, because the mean of its divisors is an integer number (1889039700).

Almost surely, 2^20061600021 is an apocalyptic number.

It is an amenable number.

20061600021 is a deficient number, since it is larger than the sum of its proper divisors (10163035179).

20061600021 is a wasteful number, since it uses less digits than its factorization.

20061600021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12593665 (or 12593659 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The spelling of 20061600021 in words is "twenty billion, sixty-one million, six hundred thousand, twenty-one".