20513104 has 10 divisors (see below), whose sum is σ = 39744170. Its totient is φ = 10256544.

The previous prime is 20513093. The next prime is 20513113. The reversal of 20513104 is 40131502.

It can be written as a sum of positive squares in only one way, i.e., 18079504 + 2433600 = 4252^2 + 1560^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 1282069 = 20513104 / (2 + 0 + 5 + 1 + 3 + 1 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641019 + ... + 641050.

It is an arithmetic number, because the mean of its divisors is an integer number (3974417).

Almost surely, 2^20513104 is an apocalyptic number.

It is an amenable number.

20513104 is a deficient number, since it is larger than the sum of its proper divisors (19231066).

20513104 is a wasteful number, since it uses less digits than its factorization.

20513104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282077 (or 1282071 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20513104 is about 4529.1394326075. The cubic root of 20513104 is about 273.7434862889.

Adding to 20513104 its reverse (40131502), we get a palindrome (60644606).

The spelling of 20513104 in words is "twenty million, five hundred thirteen thousand, one hundred four".