20920539 has 8 divisors (see below), whose sum is σ = 29362240. Its totient is φ = 13212936.

The previous prime is 20920519. The next prime is 20920541. The reversal of 20920539 is 93502902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20920539 - 2⁷ = 20920411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20920519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183457 + ... + 183570.

It is an arithmetic number, because the mean of its divisors is an integer number (3670280).

Almost surely, 2^20920539 is an apocalyptic number.

20920539 is a deficient number, since it is larger than the sum of its proper divisors (8441701).

20920539 is a wasteful number, since it uses less digits than its factorization.

20920539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367049.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 20920539 is about 4573.8975720932. The cubic root of 20920539 is about 275.5439986469.

The spelling of 20920539 in words is "twenty million, nine hundred twenty thousand, five hundred thirty-nine".