20256445 has 32 divisors (see below), whose sum is σ = 28200960. Its totient is φ = 13823040.

The previous prime is 20256433. The next prime is 20256461. The reversal of 20256445 is 54465202.

It is not a de Polignac number, because 20256445 - 2⁷ = 20256317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84636 + ... + 84874.

It is an arithmetic number, because the mean of its divisors is an integer number (881280).

Almost surely, 2^20256445 is an apocalyptic number.

It is an amenable number.

20256445 is a deficient number, since it is larger than the sum of its proper divisors (7944515).

20256445 is a wasteful number, since it uses less digits than its factorization.

20256445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 20256445 is about 4500.7160541407. The cubic root of 20256445 is about 272.5970027519.

The spelling of 20256445 in words is "twenty million, two hundred fifty-six thousand, four hundred forty-five".