20913513 has 8 divisors (see below), whose sum is σ = 27907488. Its totient is φ = 13930944.

The previous prime is 20913511. The next prime is 20913517. The reversal of 20913513 is 31531902.

It is a happy number.

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

It is not a de Polignac number, because 20913513 - 2¹ = 20913511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20913511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3370 + ... + 7292.

It is an arithmetic number, because the mean of its divisors is an integer number (3488436).

Almost surely, 2^20913513 is an apocalyptic number.

It is an amenable number.

20913513 is a deficient number, since it is larger than the sum of its proper divisors (6993975).

20913513 is a wasteful number, since it uses less digits than its factorization.

20913513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5703.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 20913513 is about 4573.1294536674. The cubic root of 20913513 is about 275.5131487582.

The spelling of 20913513 in words is "twenty million, nine hundred thirteen thousand, five hundred thirteen".