20210505513 has 16 divisors (see below), whose sum is σ = 30675234816. Its totient is φ = 11716234640.

The previous prime is 20210505473. The next prime is 20210505517. The reversal of 20210505513 is 31550501202.

It is a happy number.

It is not a de Polignac number, because 20210505513 - 2¹⁷ = 20210374441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20210505517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13313145 + ... + 13314662.

It is an arithmetic number, because the mean of its divisors is an integer number (1917202176).

Almost surely, 2^20210505513 is an apocalyptic number.

20210505513 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20210505513 is a deficient number, since it is larger than the sum of its proper divisors (10464729303).

20210505513 is a wasteful number, since it uses less digits than its factorization.

20210505513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26627844.

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

The spelling of 20210505513 in words is "twenty billion, two hundred ten million, five hundred five thousand, five hundred thirteen".