20634539 has 8 divisors (see below), whose sum is σ = 21196032. Its totient is φ = 20076840.

The previous prime is 20634533. The next prime is 20634541. The reversal of 20634539 is 93543602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20634539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20634533) 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, 12602 + ... + 14144.

It is an arithmetic number, because the mean of its divisors is an integer number (2649504).

Almost surely, 2^20634539 is an apocalyptic number.

20634539 is a deficient number, since it is larger than the sum of its proper divisors (561493).

20634539 is a wasteful number, since it uses less digits than its factorization.

20634539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 20634539 is about 4542.5256190802. The cubic root of 20634539 is about 274.2825995456.

The spelling of 20634539 in words is "twenty million, six hundred thirty-four thousand, five hundred thirty-nine".