20774681 has 8 divisors (see below), whose sum is σ = 22377984. Its totient is φ = 19229760.

The previous prime is 20774653. The next prime is 20774683. The reversal of 20774681 is 18647702.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20774681 is a prime.

It is a super-2 number, since 2×20774681² = 863174741303522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20774683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13856 + ... + 15281.

It is an arithmetic number, because the mean of its divisors is an integer number (2797248).

Almost surely, 2^20774681 is an apocalyptic number.

It is an amenable number.

20774681 is a deficient number, since it is larger than the sum of its proper divisors (1603303).

20774681 is a wasteful number, since it uses less digits than its factorization.

20774681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29191.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20774681 is about 4557.9250761723. The cubic root of 20774681 is about 274.9021403871.

The spelling of 20774681 in words is "twenty million, seven hundred seventy-four thousand, six hundred eighty-one".