20531443438 has 8 divisors (see below), whose sum is σ = 33596907480. Its totient is φ = 9332474280.

The previous prime is 20531443423. The next prime is 20531443459. The reversal of 20531443438 is 83434413502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20531443397 and 20531443406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466623693 + ... + 466623736.

It is an arithmetic number, because the mean of its divisors is an integer number (4199613435).

Almost surely, 2^20531443438 is an apocalyptic number.

20531443438 is a deficient number, since it is larger than the sum of its proper divisors (13065464042).

20531443438 is a wasteful number, since it uses less digits than its factorization.

20531443438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933247442.

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 20531443438 in words is "twenty billion, five hundred thirty-one million, four hundred forty-three thousand, four hundred thirty-eight".