20797439 has 4 divisors (see below), whose sum is σ = 22397256. Its totient is φ = 19197624.

The previous prime is 20797411. The next prime is 20797463. The reversal of 20797439 is 93479702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20797439 - 2²⁴ = 4020223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20797396 and 20797405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20797499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799889 + ... + 799914.

It is an arithmetic number, because the mean of its divisors is an integer number (5599314).

Almost surely, 2^20797439 is an apocalyptic number.

20797439 is a deficient number, since it is larger than the sum of its proper divisors (1599817).

20797439 is a wasteful number, since it uses less digits than its factorization.

20797439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599816.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 20797439 is about 4560.4209235552. The cubic root of 20797439 is about 275.0024859279.

The spelling of 20797439 in words is "twenty million, seven hundred ninety-seven thousand, four hundred thirty-nine".