20773581 has 16 divisors (see below), whose sum is σ = 28169856. Its totient is φ = 13615616.

The previous prime is 20773573. The next prime is 20773589. The reversal of 20773581 is 18537702.

It is an interprime number because it is at equal distance from previous prime (20773573) and next prime (20773589).

It is a cyclic number.

It is not a de Polignac number, because 20773581 - 2³ = 20773573 is a prime.

It is a super-2 number, since 2×20773581² = 863083335127122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20773589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78856 + ... + 79118.

It is an arithmetic number, because the mean of its divisors is an integer number (1760616).

Almost surely, 2^20773581 is an apocalyptic number.

It is an amenable number.

20773581 is a deficient number, since it is larger than the sum of its proper divisors (7396275).

20773581 is a wasteful number, since it uses less digits than its factorization.

20773581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 20773581 is about 4557.8044056322. The cubic root of 20773581 is about 274.8972883641.

The spelling of 20773581 in words is "twenty million, seven hundred seventy-three thousand, five hundred eighty-one".