20742173458 has 8 divisors (see below), whose sum is σ = 31640603760. Its totient is φ = 10195305540.

The previous prime is 20742173453. The next prime is 20742173477. The reversal of 20742173458 is 85437124702.

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

It is not an unprimeable number, because it can be changed into a prime (20742173453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87890448 + ... + 87890683.

It is an arithmetic number, because the mean of its divisors is an integer number (3955075470).

Almost surely, 2^20742173458 is an apocalyptic number.

20742173458 is a deficient number, since it is larger than the sum of its proper divisors (10898430302).

20742173458 is a wasteful number, since it uses less digits than its factorization.

20742173458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175781192.

The product of its (nonzero) digits is 376320, while the sum is 43.

The spelling of 20742173458 in words is "twenty billion, seven hundred forty-two million, one hundred seventy-three thousand, four hundred fifty-eight".