20609638 has 8 divisors (see below), whose sum is σ = 35330832. Its totient is φ = 8832696.

The previous prime is 20609581. The next prime is 20609639. The reversal of 20609638 is 83690602.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609639) 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, 736045 + ... + 736072.

It is an arithmetic number, because the mean of its divisors is an integer number (4416354).

Almost surely, 2^20609638 is an apocalyptic number.

20609638 is a deficient number, since it is larger than the sum of its proper divisors (14721194).

20609638 is a wasteful number, since it uses less digits than its factorization.

20609638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472126.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 20609638 is about 4539.7839155625. The cubic root of 20609638 is about 274.1722237623.

The spelling of 20609638 in words is "twenty million, six hundred nine thousand, six hundred thirty-eight".