20455775 has 6 divisors (see below), whose sum is σ = 25365192. Its totient is φ = 16364600.

The previous prime is 20455711. The next prime is 20455823. The reversal of 20455775 is 57755402.

It is a happy number.

It is not a de Polignac number, because 20455775 - 2⁶ = 20455711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409091 + ... + 409140.

It is an arithmetic number, because the mean of its divisors is an integer number (4227532).

Almost surely, 2^20455775 is an apocalyptic number.

20455775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20455775 is a deficient number, since it is larger than the sum of its proper divisors (4909417).

20455775 is an equidigital number, since it uses as much as digits as its factorization.

20455775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818241 (or 818236 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 35.

The square root of 20455775 is about 4522.8060979883. The cubic root of 20455775 is about 273.4882334707.

The spelling of 20455775 in words is "twenty million, four hundred fifty-five thousand, seven hundred seventy-five".