20531338 has 4 divisors (see below), whose sum is σ = 30797010. Its totient is φ = 10265668.

The previous prime is 20531297. The next prime is 20531347. The reversal of 20531338 is 83313502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17698849 + 2832489 = 4207^2 + 1683^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5132833 + ... + 5132836.

Almost surely, 2^20531338 is an apocalyptic number.

20531338 is a deficient number, since it is larger than the sum of its proper divisors (10265672).

20531338 is a wasteful number, since it uses less digits than its factorization.

20531338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10265671.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20531338 is about 4531.1519506633. The cubic root of 20531338 is about 273.8245720264.

The spelling of 20531338 in words is "twenty million, five hundred thirty-one thousand, three hundred thirty-eight".