20264981 has 8 divisors (see below), whose sum is σ = 22140000. Its totient is φ = 18395440.

The previous prime is 20264977. The next prime is 20264989. The reversal of 20264981 is 18946202.

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 20264981 - 2² = 20264977 is a prime.

It is a super-2 number, since 2×20264981² = 821338909860722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20264989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12770 + ... + 14268.

It is an arithmetic number, because the mean of its divisors is an integer number (2767500).

Almost surely, 2^20264981 is an apocalyptic number.

It is an amenable number.

20264981 is a deficient number, since it is larger than the sum of its proper divisors (1875019).

20264981 is a wasteful number, since it uses less digits than its factorization.

20264981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 20264981 is about 4501.6642478088. The cubic root of 20264981 is about 272.6352878713.

It can be divided in two parts, 2026 and 4981, that added together give a palindrome (7007).

The spelling of 20264981 in words is "twenty million, two hundred sixty-four thousand, nine hundred eighty-one".