20513479 has 8 divisors (see below), whose sum is σ = 23943168. Its totient is φ = 17208600.

The previous prime is 20513461. The next prime is 20513513. The reversal of 20513479 is 97431502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20513479 - 2¹⁹ = 19989191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20513479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30847 + ... + 31504.

It is an arithmetic number, because the mean of its divisors is an integer number (2992896).

Almost surely, 2^20513479 is an apocalyptic number.

20513479 is a deficient number, since it is larger than the sum of its proper divisors (3429689).

20513479 is an equidigital number, since it uses as much as digits as its factorization.

20513479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62405.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20513479 is about 4529.1808310113. The cubic root of 20513479 is about 273.7451543800.

The spelling of 20513479 in words is "twenty million, five hundred thirteen thousand, four hundred seventy-nine".