20720835 has 12 divisors (see below), whose sum is σ = 35916192. Its totient is φ = 11051088.

The previous prime is 20720789. The next prime is 20720893. The reversal of 20720835 is 53802702.

It is not a de Polignac number, because 20720835 - 2⁶ = 20720771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20720799 and 20720808.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230187 + ... + 230276.

It is an arithmetic number, because the mean of its divisors is an integer number (2993016).

Almost surely, 2^20720835 is an apocalyptic number.

20720835 is a deficient number, since it is larger than the sum of its proper divisors (15195357).

20720835 is a wasteful number, since it uses less digits than its factorization.

20720835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460474 (or 460471 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20720835 is about 4552.0143892567. The cubic root of 20720835 is about 274.6644281468.

The spelling of 20720835 in words is "twenty million, seven hundred twenty thousand, eight hundred thirty-five".