20724677 has 2 divisors, whose sum is σ = 20724678. Its totient is φ = 20724676.

The previous prime is 20724673. The next prime is 20724707. The reversal of 20724677 is 77642702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13184161 + 7540516 = 3631^2 + 2746^2 .

It is a cyclic number.

It is not a de Polignac number, because 20724677 - 2² = 20724673 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20724673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10362338 + 10362339.

It is an arithmetic number, because the mean of its divisors is an integer number (10362339).

Almost surely, 2^20724677 is an apocalyptic number.

It is an amenable number.

20724677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20724677 is an equidigital number, since it uses as much as digits as its factorization.

20724677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32928, while the sum is 35.

The square root of 20724677 is about 4552.4363806648. The cubic root of 20724677 is about 274.6814029376.

The spelling of 20724677 in words is "twenty million, seven hundred twenty-four thousand, six hundred seventy-seven".