20645711 has 2 divisors, whose sum is σ = 20645712. Its totient is φ = 20645710.

The previous prime is 20645707. The next prime is 20645749. The reversal of 20645711 is 11754602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20645711 - 2² = 20645707 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20645791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322855 + 10322856.

It is an arithmetic number, because the mean of its divisors is an integer number (10322856).

Almost surely, 2^20645711 is an apocalyptic number.

20645711 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645711 is an equidigital number, since it uses as much as digits as its factorization.

20645711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20645711 is about 4543.7551650590. The cubic root of 20645711 is about 274.3320915219.

The spelling of 20645711 in words is "twenty million, six hundred forty-five thousand, seven hundred eleven".