20538374 has 4 divisors (see below), whose sum is σ = 30807564. Its totient is φ = 10269186.

The previous prime is 20538361. The next prime is 20538403. The reversal of 20538374 is 47383502.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20538374.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5134592 + ... + 5134595.

It is an arithmetic number, because the mean of its divisors is an integer number (7701891).

Almost surely, 2^20538374 is an apocalyptic number.

20538374 is a deficient number, since it is larger than the sum of its proper divisors (10269190).

20538374 is a wasteful number, since it uses less digits than its factorization.

20538374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10269189.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20538374 is about 4531.9282871643. The cubic root of 20538374 is about 273.8558479496.

The spelling of 20538374 in words is "twenty million, five hundred thirty-eight thousand, three hundred seventy-four".