20131438 has 4 divisors (see below), whose sum is σ = 30197160. Its totient is φ = 10065718.

The previous prime is 20131427. The next prime is 20131487. The reversal of 20131438 is 83413102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83413102 = 2 ⋅41706551.

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, 5032858 + ... + 5032861.

It is an arithmetic number, because the mean of its divisors is an integer number (7549290).

Almost surely, 2^20131438 is an apocalyptic number.

20131438 is a deficient number, since it is larger than the sum of its proper divisors (10065722).

20131438 is a wasteful number, since it uses less digits than its factorization.

20131438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10065721.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20131438 is about 4486.8071052810. The cubic root of 20131438 is about 272.0350931509.

The spelling of 20131438 in words is "twenty million, one hundred thirty-one thousand, four hundred thirty-eight".