20772979 has 8 divisors (see below), whose sum is σ = 22086432. Its totient is φ = 19493760.

The previous prime is 20772949. The next prime is 20773043. The reversal of 20772979 is 97927702.

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 20772979 - 2⁹ = 20772467 is a prime.

It is a super-3 number, since 3×20772979³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20772949) 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, 7302 + ... + 9739.

It is an arithmetic number, because the mean of its divisors is an integer number (2760804).

Almost surely, 2^20772979 is an apocalyptic number.

20772979 is a deficient number, since it is larger than the sum of its proper divisors (1313453).

20772979 is a wasteful number, since it uses less digits than its factorization.

20772979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17117.

The product of its (nonzero) digits is 111132, while the sum is 43.

The square root of 20772979 is about 4557.7383645839. The cubic root of 20772979 is about 274.8946329117.

It can be divided in two parts, 20 and 772979, that multiplied together give a triangular number (15459580 = T₅₅₆₀).

The spelling of 20772979 in words is "twenty million, seven hundred seventy-two thousand, nine hundred seventy-nine".