20001900051 has 32 divisors (see below), whose sum is σ = 33921093120. Its totient is φ = 11410945632.

The previous prime is 20001900043. The next prime is 20001900071. The reversal of 20001900051 is 15000910002.

It is not a de Polignac number, because 20001900051 - 2³ = 20001900043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001899997 and 20001900033.

It is not an unprimeable number, because it can be changed into a prime (20001900071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29536 + ... + 202178.

It is an arithmetic number, because the mean of its divisors is an integer number (1060034160).

Almost surely, 2^20001900051 is an apocalyptic number.

20001900051 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20001900051 is a deficient number, since it is larger than the sum of its proper divisors (13919193069).

20001900051 is a wasteful number, since it uses less digits than its factorization.

20001900051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173272 (or 173266 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The spelling of 20001900051 in words is "twenty billion, one million, nine hundred thousand, fifty-one".