20513907191603 has 16 divisors (see below), whose sum is σ = 23506308146880. Its totient is φ = 17536972992000.

The previous prime is 20513907191599. The next prime is 20513907191681. The reversal of 20513907191603 is 30619170931502.

It is not a de Polignac number, because 20513907191603 - 2² = 20513907191599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20513907191803) 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, 41692343 + ... + 42181503.

It is an arithmetic number, because the mean of its divisors is an integer number (1469144259180).

Almost surely, 2^{20513907191603} is an apocalyptic number.

20513907191603 is a deficient number, since it is larger than the sum of its proper divisors (2992400955277).

20513907191603 is a wasteful number, since it uses less digits than its factorization.

20513907191603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504958.

The product of its (nonzero) digits is 306180, while the sum is 47.

The spelling of 20513907191603 in words is "twenty trillion, five hundred thirteen billion, nine hundred seven million, one hundred ninety-one thousand, six hundred three".