20620539 has 12 divisors (see below), whose sum is σ = 29825016. Its totient is φ = 13728672.

The previous prime is 20620531. The next prime is 20620547. The reversal of 20620539 is 93502602.

20620539 is a `hidden beast` number, since 2 + 0 + 620 + 5 + 39 = 666.

It is an interprime number because it is at equal distance from previous prime (20620531) and next prime (20620547).

It is not a de Polignac number, because 20620539 - 2³ = 20620531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20620531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10887 + ... + 12639.

It is an arithmetic number, because the mean of its divisors is an integer number (2485418).

Almost surely, 2^20620539 is an apocalyptic number.

20620539 is a deficient number, since it is larger than the sum of its proper divisors (9204477).

20620539 is a wasteful number, since it uses less digits than its factorization.

20620539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066 (or 3063 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20620539 is about 4540.9843646505. The cubic root of 20620539 is about 274.2205542994.

The spelling of 20620539 in words is "twenty million, six hundred twenty thousand, five hundred thirty-nine".