20415500001 has 24 divisors (see below), whose sum is σ = 31947639360. Its totient is φ = 12488142816.

The previous prime is 20415499987. The next prime is 20415500003. The reversal of 20415500001 is 10000551402.

It is not a de Polignac number, because 20415500001 - 2⁵ = 20415499969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20415500003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 502891 + ... + 541968.

It is an arithmetic number, because the mean of its divisors is an integer number (1331151640).

Almost surely, 2^20415500001 is an apocalyptic number.

It is an amenable number.

20415500001 is a deficient number, since it is larger than the sum of its proper divisors (11532139359).

20415500001 is a wasteful number, since it uses less digits than its factorization.

20415500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045045 (or 1045042 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The spelling of 20415500001 in words is "twenty billion, four hundred fifteen million, five hundred thousand, one".