20965061 has 4 divisors (see below), whose sum is σ = 22577772. Its totient is φ = 19352352.

The previous prime is 20965027. The next prime is 20965067. The reversal of 20965061 is 16056902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8673025 + 12292036 = 2945^2 + 3506^2 .

It is a cyclic number.

It is not a de Polignac number, because 20965061 - 2⁶ = 20964997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806336 + ... + 806361.

It is an arithmetic number, because the mean of its divisors is an integer number (5644443).

Almost surely, 2^20965061 is an apocalyptic number.

It is an amenable number.

20965061 is a deficient number, since it is larger than the sum of its proper divisors (1612711).

20965061 is a wasteful number, since it uses less digits than its factorization.

20965061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612710.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 20965061 is about 4578.7619505714. The cubic root of 20965061 is about 275.7393262727.

The spelling of 20965061 in words is "twenty million, nine hundred sixty-five thousand, sixty-one".