20773853 has 4 divisors (see below), whose sum is σ = 21677088. Its totient is φ = 19870620.

The previous prime is 20773793. The next prime is 20773871. The reversal of 20773853 is 35837702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35837702 = 2 ⋅17918851.

It is not a de Polignac number, because 20773853 - 2⁶ = 20773789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20773873) 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, 451583 + ... + 451628.

It is an arithmetic number, because the mean of its divisors is an integer number (5419272).

Almost surely, 2^20773853 is an apocalyptic number.

20773853 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20773853 is a deficient number, since it is larger than the sum of its proper divisors (903235).

20773853 is an equidigital number, since it uses as much as digits as its factorization.

20773853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903234.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 20773853 is about 4557.8342444630. The cubic root of 20773853 is about 274.8984881530.

The spelling of 20773853 in words is "twenty million, seven hundred seventy-three thousand, eight hundred fifty-three".