20013921771438 has 32 divisors (see below), whose sum is σ = 45759973881600. Its totient is φ = 5716529991360.

The previous prime is 20013921771427. The next prime is 20013921771479. The reversal of 20013921771438 is 83417712931002.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72083623 + ... + 72360738.

It is an arithmetic number, because the mean of its divisors is an integer number (1429999183800).

Almost surely, 2^{20013921771438} is an apocalyptic number.

20013921771438 is an abundant number, since it is smaller than the sum of its proper divisors (25746052110162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20013921771438 is a wasteful number, since it uses less digits than its factorization.

20013921771438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144447672.

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 20013921771438 in words is "twenty trillion, thirteen billion, nine hundred twenty-one million, seven hundred seventy-one thousand, four hundred thirty-eight".