20077969 has 4 divisors (see below), whose sum is σ = 21259044. Its totient is φ = 18896896.

The previous prime is 20077963. The next prime is 20077973. The reversal of 20077969 is 96977002.

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 15303744 + 4774225 = 3912^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 20077969 - 2³ = 20077961 is a prime.

It is a super-2 number, since 2×20077969² = 806249678329922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20077961) 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, 590512 + ... + 590545.

It is an arithmetic number, because the mean of its divisors is an integer number (5314761).

Almost surely, 2^20077969 is an apocalyptic number.

It is an amenable number.

20077969 is a deficient number, since it is larger than the sum of its proper divisors (1181075).

20077969 is a wasteful number, since it uses less digits than its factorization.

20077969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181074.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 20077969 is about 4480.8446748353. The cubic root of 20077969 is about 271.7940383229.

The spelling of 20077969 in words is "twenty million, seventy-seven thousand, nine hundred sixty-nine".