20513101 has 16 divisors (see below), whose sum is σ = 24966144. Its totient is φ = 16452864.

The previous prime is 20513093. The next prime is 20513113. The reversal of 20513101 is 10131502.

It is a cyclic number.

It is not a de Polignac number, because 20513101 - 2³ = 20513093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513191) 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, 26151 + ... + 26923.

It is an arithmetic number, because the mean of its divisors is an integer number (1560384).

Almost surely, 2^20513101 is an apocalyptic number.

It is an amenable number.

20513101 is a deficient number, since it is larger than the sum of its proper divisors (4453043).

20513101 is a wasteful number, since it uses less digits than its factorization.

20513101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 20513101 is about 4529.1391014187. The cubic root of 20513101 is about 273.7434729440.

Adding to 20513101 its reverse (10131502), we get a palindrome (30644603).

The spelling of 20513101 in words is "twenty million, five hundred thirteen thousand, one hundred one".