20506667061 has 8 divisors (see below), whose sum is σ = 28950588864. Its totient is φ = 12866928320.

The previous prime is 20506667057. The next prime is 20506667063. The reversal of 20506667061 is 16076660502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20506667061 - 2² = 20506667057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506667063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201045705 + ... + 201045806.

It is an arithmetic number, because the mean of its divisors is an integer number (3618823608).

Almost surely, 2^20506667061 is an apocalyptic number.

It is an amenable number.

20506667061 is a deficient number, since it is larger than the sum of its proper divisors (8443921803).

20506667061 is a wasteful number, since it uses less digits than its factorization.

20506667061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402091531.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 20506667061 in words is "twenty billion, five hundred six million, six hundred sixty-seven thousand, sixty-one".