20049538 has 4 divisors (see below), whose sum is σ = 30074310. Its totient is φ = 10024768.

The previous prime is 20049509. The next prime is 20049559. The reversal of 20049538 is 83594002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83594002 = 2 ⋅41797001.

It can be written as a sum of positive squares in only one way, i.e., 17530969 + 2518569 = 4187^2 + 1587^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5012383 + ... + 5012386.

Almost surely, 2^20049538 is an apocalyptic number.

20049538 is a deficient number, since it is larger than the sum of its proper divisors (10024772).

20049538 is a wasteful number, since it uses less digits than its factorization.

20049538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10024771.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20049538 is about 4477.6710464258. The cubic root of 20049538 is about 271.6656882464.

The spelling of 20049538 in words is "twenty million, forty-nine thousand, five hundred thirty-eight".