20620769 has 16 divisors (see below), whose sum is σ = 23284800. Its totient is φ = 18129216.

The previous prime is 20620751. The next prime is 20620771. The reversal of 20620769 is 96702602.

It is a cyclic number.

It is not a de Polignac number, because 20620769 - 2⁸ = 20620513 is a prime.

It is a super-2 number, since 2×20620769² = 850432228302722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20620709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30962 + ... + 31620.

It is an arithmetic number, because the mean of its divisors is an integer number (1455300).

Almost surely, 2^20620769 is an apocalyptic number.

20620769 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20620769 is a deficient number, since it is larger than the sum of its proper divisors (2664031).

20620769 is a wasteful number, since it uses less digits than its factorization.

20620769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 20620769 is about 4541.0096894854. The cubic root of 20620769 is about 274.2215738410.

The spelling of 20620769 in words is "twenty million, six hundred twenty thousand, seven hundred sixty-nine".