20539877 has 2 divisors, whose sum is σ = 20539878. Its totient is φ = 20539876.

The previous prime is 20539873. The next prime is 20539879. The reversal of 20539877 is 77893502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14394436 + 6145441 = 3794^2 + 2479^2 .

It is a cyclic number.

It is not a de Polignac number, because 20539877 - 2² = 20539873 is a prime.

Together with 20539879, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20539873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10269938 + 10269939.

It is an arithmetic number, because the mean of its divisors is an integer number (10269939).

Almost surely, 2^20539877 is an apocalyptic number.

It is an amenable number.

20539877 is a deficient number, since it is larger than the sum of its proper divisors (1).

20539877 is an equidigital number, since it uses as much as digits as its factorization.

20539877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 20539877 is about 4532.0941075843. The cubic root of 20539877 is about 273.8625280516.

The spelling of 20539877 in words is "twenty million, five hundred thirty-nine thousand, eight hundred seventy-seven".