20513543407 has 32 divisors (see below), whose sum is σ = 25076620800. Its totient is φ = 16754754240.

The previous prime is 20513543383. The next prime is 20513543419. The reversal of 20513543407 is 70434531502.

It is not a de Polignac number, because 20513543407 - 2⁷ = 20513543279 is a prime.

It is a super-2 number, since 2×20513543407² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513543507) 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, 587748 + ... + 621670.

It is an arithmetic number, because the mean of its divisors is an integer number (783644400).

Almost surely, 2^20513543407 is an apocalyptic number.

20513543407 is a deficient number, since it is larger than the sum of its proper divisors (4563077393).

20513543407 is an equidigital number, since it uses as much as digits as its factorization.

20513543407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34028 (or 34014 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 34.

The spelling of 20513543407 in words is "twenty billion, five hundred thirteen million, five hundred forty-three thousand, four hundred seven".