20170450642 has 8 divisors (see below), whose sum is σ = 30493910016. Its totient is φ = 10005813972.

The previous prime is 20170450637. The next prime is 20170450661. The reversal of 20170450642 is 24605407102.

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, 39705358 + ... + 39705865.

It is an arithmetic number, because the mean of its divisors is an integer number (3811738752).

Almost surely, 2^20170450642 is an apocalyptic number.

20170450642 is a deficient number, since it is larger than the sum of its proper divisors (10323459374).

20170450642 is a wasteful number, since it uses less digits than its factorization.

20170450642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79411352.

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 20170450642 its reverse (24605407102), we get a palindrome (44775857744).

The spelling of 20170450642 in words is "twenty billion, one hundred seventy million, four hundred fifty thousand, six hundred forty-two".