20794981 has 2 divisors, whose sum is σ = 20794982. Its totient is φ = 20794980.

The previous prime is 20794951. The next prime is 20794997. The reversal of 20794981 is 18949702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10458756 + 10336225 = 3234^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 20794981 - 2⁹ = 20794469 is a prime.

It is a super-2 number, since 2×20794981² = 864862469580722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20794931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10397490 + 10397491.

It is an arithmetic number, because the mean of its divisors is an integer number (10397491).

Almost surely, 2^20794981 is an apocalyptic number.

It is an amenable number.

20794981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20794981 is an equidigital number, since it uses as much as digits as its factorization.

20794981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 20794981 is about 4560.1514229245. The cubic root of 20794981 is about 274.9916515372.

The spelling of 20794981 in words is "twenty million, seven hundred ninety-four thousand, nine hundred eighty-one".