20742491906 has 8 divisors (see below), whose sum is σ = 31121015184. Its totient is φ = 10368820180.

The previous prime is 20742491899. The next prime is 20742491921. The reversal of 20742491906 is 60919424702.

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, 1202180 + ... + 1219311.

It is an arithmetic number, because the mean of its divisors is an integer number (3890126898).

Almost surely, 2^20742491906 is an apocalyptic number.

20742491906 is a deficient number, since it is larger than the sum of its proper divisors (10378523278).

20742491906 is a wasteful number, since it uses less digits than its factorization.

20742491906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425776.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 20742491906 in words is "twenty billion, seven hundred forty-two million, four hundred ninety-one thousand, nine hundred six".