20917338 has 16 divisors (see below), whose sum is σ = 45052896. Its totient is φ = 6436080.

The previous prime is 20917331. The next prime is 20917349. The reversal of 20917338 is 83371902.

It is a junction number, because it is equal to n+sod(n) for n = 20917299 and 20917308.

It is not an unprimeable number, because it can be changed into a prime (20917331) 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, 134008 + ... + 134163.

It is an arithmetic number, because the mean of its divisors is an integer number (2815806).

Almost surely, 2^20917338 is an apocalyptic number.

20917338 is an abundant number, since it is smaller than the sum of its proper divisors (24135558).

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

20917338 is a wasteful number, since it uses less digits than its factorization.

20917338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268189.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20917338 is about 4573.5476383219. The cubic root of 20917338 is about 275.5299444946.

The spelling of 20917338 in words is "twenty million, nine hundred seventeen thousand, three hundred thirty-eight".