20772518 has 8 divisors (see below), whose sum is σ = 33555648. Its totient is φ = 9587304.

The previous prime is 20772517. The next prime is 20772547. The reversal of 20772518 is 81527702.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20772517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399446 + ... + 399497.

It is an arithmetic number, because the mean of its divisors is an integer number (4194456).

Almost surely, 2^20772518 is an apocalyptic number.

20772518 is a deficient number, since it is larger than the sum of its proper divisors (12783130).

20772518 is a wasteful number, since it uses less digits than its factorization.

20772518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798958.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 20772518 is about 4557.6877909747. The cubic root of 20772518 is about 274.8925993827.

The spelling of 20772518 in words is "twenty million, seven hundred seventy-two thousand, five hundred eighteen".