20768331538 has 8 divisors (see below), whose sum is σ = 31153668480. Its totient is φ = 10383775380.

The previous prime is 20768331533. The next prime is 20768331541. The reversal of 20768331538 is 83513386702.

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 (20768331533) 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, 123418 + ... + 238261.

It is an arithmetic number, because the mean of its divisors is an integer number (3894208560).

Almost surely, 2^20768331538 is an apocalyptic number.

20768331538 is a deficient number, since it is larger than the sum of its proper divisors (10385336942).

20768331538 is a wasteful number, since it uses less digits than its factorization.

20768331538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390392.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 20768331538 in words is "twenty billion, seven hundred sixty-eight million, three hundred thirty-one thousand, five hundred thirty-eight".