20215443442 has 8 divisors (see below), whose sum is σ = 30389519196. Its totient is φ = 10085603712.

The previous prime is 20215443419. The next prime is 20215443467. The reversal of 20215443442 is 24434451202.

It can be written as a sum of positive squares in 2 ways, for example, as 16786052721 + 3429390721 = 129561^2 + 58561^2 .

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

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, 11057863 + ... + 11059690.

Almost surely, 2^20215443442 is an apocalyptic number.

20215443442 is a deficient number, since it is larger than the sum of its proper divisors (10174075754).

20215443442 is a wasteful number, since it uses less digits than its factorization.

20215443442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22118012.

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 20215443442 its reverse (24434451202), we get a palindrome (44649894644).

The spelling of 20215443442 in words is "twenty billion, two hundred fifteen million, four hundred forty-three thousand, four hundred forty-two".