20742677 has 2 divisors, whose sum is σ = 20742678. Its totient is φ = 20742676.

The previous prime is 20742653. The next prime is 20742697. The reversal of 20742677 is 77624702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17230801 + 3511876 = 4151^2 + 1874^2 .

It is a cyclic number.

It is not a de Polignac number, because 20742677 - 2¹² = 20738581 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20742637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10371338 + 10371339.

It is an arithmetic number, because the mean of its divisors is an integer number (10371339).

Almost surely, 2^20742677 is an apocalyptic number.

It is an amenable number.

20742677 is a deficient number, since it is larger than the sum of its proper divisors (1).

20742677 is an equidigital number, since it uses as much as digits as its factorization.

20742677 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 20742677 is about 4554.4129149650. The cubic root of 20742677 is about 274.7609029225.

The spelling of 20742677 in words is "twenty million, seven hundred forty-two thousand, six hundred seventy-seven".