20505506001 has 8 divisors (see below), whose sum is σ = 27596195424. Its totient is φ = 13542576960.

The previous prime is 20505505973. The next prime is 20505506027. The reversal of 20505506001 is 10060550502.

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

It is not a de Polignac number, because 20505506001 - 2¹⁰ = 20505504977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20505506071) 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, 31939720 + ... + 31940361.

It is an arithmetic number, because the mean of its divisors is an integer number (3449524428).

Almost surely, 2^20505506001 is an apocalyptic number.

It is an amenable number.

20505506001 is a deficient number, since it is larger than the sum of its proper divisors (7090689423).

20505506001 is a wasteful number, since it uses less digits than its factorization.

20505506001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63880191.

The product of its (nonzero) digits is 1500, while the sum is 24.

The spelling of 20505506001 in words is "twenty billion, five hundred five million, five hundred six thousand, one".