20771929 has 2 divisors, whose sum is σ = 20771930. Its totient is φ = 20771928.

The previous prime is 20771923. The next prime is 20771939. The reversal of 20771929 is 92917702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12638025 + 8133904 = 3555^2 + 2852^2 .

It is a cyclic number.

It is not a de Polignac number, because 20771929 - 2⁵ = 20771897 is a prime.

It is not a weakly prime, because it can be changed into another prime (20771923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10385964 + 10385965.

It is an arithmetic number, because the mean of its divisors is an integer number (10385965).

Almost surely, 2^20771929 is an apocalyptic number.

It is an amenable number.

20771929 is a deficient number, since it is larger than the sum of its proper divisors (1).

20771929 is an equidigital number, since it uses as much as digits as its factorization.

20771929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 20771929 is about 4557.6231744189. The cubic root of 20771929 is about 274.8900011859.

The spelling of 20771929 in words is "twenty million, seven hundred seventy-one thousand, nine hundred twenty-nine".