20695049 has 4 divisors (see below), whose sum is σ = 20714820. Its totient is φ = 20675280.

The previous prime is 20695033. The next prime is 20695061. The reversal of 20695049 is 94059602.

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 937024 + 19758025 = 968^2 + 4445^2 .

It is a cyclic number.

It is not a de Polignac number, because 20695049 - 2⁴ = 20695033 is a prime.

It is a super-2 number, since 2×20695049² = 856570106224802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20695349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8222 + ... + 10439.

It is an arithmetic number, because the mean of its divisors is an integer number (5178705).

Almost surely, 2^20695049 is an apocalyptic number.

It is an amenable number.

20695049 is a deficient number, since it is larger than the sum of its proper divisors (19771).

20695049 is a wasteful number, since it uses less digits than its factorization.

20695049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19770.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 20695049 is about 4549.1811351055. The cubic root of 20695049 is about 274.5504456599.

The spelling of 20695049 in words is "twenty million, six hundred ninety-five thousand, forty-nine".