20797139 has 8 divisors (see below), whose sum is σ = 22867968. Its totient is φ = 18756360.

The previous prime is 20797121. The next prime is 20797141. The reversal of 20797139 is 93179702.

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

It is a cyclic number.

It is not a de Polignac number, because 20797139 - 2²⁰ = 19748563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20797109) 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, 6047 + ... + 8840.

It is an arithmetic number, because the mean of its divisors is an integer number (2858496).

Almost surely, 2^20797139 is an apocalyptic number.

20797139 is a deficient number, since it is larger than the sum of its proper divisors (2070829).

20797139 is a wasteful number, since it uses less digits than its factorization.

20797139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15025.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 20797139 is about 4560.3880317359. The cubic root of 20797139 is about 275.0011636314.

The spelling of 20797139 in words is "twenty million, seven hundred ninety-seven thousand, one hundred thirty-nine".