20765398 has 16 divisors (see below), whose sum is σ = 33312384. Its totient is φ = 9673600.

The previous prime is 20765351. The next prime is 20765411. The reversal of 20765398 is 89356702.

It is a self number, because there is not a number n which added to its sum of digits gives 20765398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411 + ... + 6457.

It is an arithmetic number, because the mean of its divisors is an integer number (2082024).

Almost surely, 2^20765398 is an apocalyptic number.

20765398 is a deficient number, since it is larger than the sum of its proper divisors (12546986).

20765398 is a wasteful number, since it uses less digits than its factorization.

20765398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6167.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20765398 is about 4556.9066262104. The cubic root of 20765398 is about 274.8611883461.

The spelling of 20765398 in words is "twenty million, seven hundred sixty-five thousand, three hundred ninety-eight".