20420977606727 has 2 divisors, whose sum is σ = 20420977606728. Its totient is φ = 20420977606726.

The previous prime is 20420977606643. The next prime is 20420977606769. The reversal of 20420977606727 is 72760677902402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20420977606727 - 2¹² = 20420977602631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420977608727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210488803363 + 10210488803364.

It is an arithmetic number, because the mean of its divisors is an integer number (10210488803364).

Almost surely, 2^{20420977606727} is an apocalyptic number.

20420977606727 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420977606727 is an equidigital number, since it uses as much as digits as its factorization.

20420977606727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24893568, while the sum is 59.

The spelling of 20420977606727 in words is "twenty trillion, four hundred twenty billion, nine hundred seventy-seven million, six hundred six thousand, seven hundred twenty-seven".