2020640400051 has 128 divisors (see below), whose sum is σ = 3732763668480. Its totient is φ = 941414842368.

The previous prime is 2020640400019. The next prime is 2020640400061. The reversal of 2020640400051 is 1500040460202.

It is not a de Polignac number, because 2020640400051 - 2⁵ = 2020640400019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2020640399994 and 2020640400030.

It is not an unprimeable number, because it can be changed into a prime (2020640400061) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5478795 + ... + 5835963.

It is an arithmetic number, because the mean of its divisors is an integer number (29162216160).

Almost surely, 2^{2020640400051} is an apocalyptic number.

2020640400051 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2020640400051 is a deficient number, since it is larger than the sum of its proper divisors (1712123268429).

2020640400051 is a wasteful number, since it uses less digits than its factorization.

2020640400051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357285.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 2020640400051 its reverse (1500040460202), we get a palindrome (3520680860253).

The spelling of 2020640400051 in words is "two trillion, twenty billion, six hundred forty million, four hundred thousand, fifty-one".