20513634 has 8 divisors (see below), whose sum is σ = 41027280. Its totient is φ = 6837876.

The previous prime is 20513627. The next prime is 20513639. The reversal of 20513634 is 43631502.

It is a happy number.

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

20513634 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20513639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1709464 + ... + 1709475.

It is an arithmetic number, because the mean of its divisors is an integer number (5128410).

Almost surely, 2^20513634 is an apocalyptic number.

20513634 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20513634 is a wasteful number, since it uses less digits than its factorization.

20513634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418944.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 20513634 is about 4529.1979422410. The cubic root of 20513634 is about 273.7458438517.

The spelling of 20513634 in words is "twenty million, five hundred thirteen thousand, six hundred thirty-four".