20102938 has 4 divisors (see below), whose sum is σ = 30154410. Its totient is φ = 10051468.

The previous prime is 20102933. The next prime is 20102947. The reversal of 20102938 is 83920102.

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., 15578809 + 4524129 = 3947^2 + 2127^2 .

It is not an unprimeable number, because it can be changed into a prime (20102933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025733 + ... + 5025736.

Almost surely, 2^20102938 is an apocalyptic number.

20102938 is a deficient number, since it is larger than the sum of its proper divisors (10051472).

20102938 is a wasteful number, since it uses less digits than its factorization.

20102938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10051471.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20102938 is about 4483.6300025760. The cubic root of 20102938 is about 271.9066595095.

The spelling of 20102938 in words is "twenty million, one hundred two thousand, nine hundred thirty-eight".