20905338 has 16 divisors (see below), whose sum is σ = 41997600. Its totient is φ = 6937296.

The previous prime is 20905337. The next prime is 20905349. The reversal of 20905338 is 83350902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20905331) 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, 6313 + ... + 9036.

It is an arithmetic number, because the mean of its divisors is an integer number (2624850).

Almost surely, 2^20905338 is an apocalyptic number.

20905338 is an abundant number, since it is smaller than the sum of its proper divisors (21092262).

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

20905338 is a wasteful number, since it uses less digits than its factorization.

20905338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15581.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20905338 is about 4572.2355582363. The cubic root of 20905338 is about 275.4772451213.

The spelling of 20905338 in words is "twenty million, nine hundred five thousand, three hundred thirty-eight".