20456745 has 64 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 9676800.

The previous prime is 20456713. The next prime is 20456747. The reversal of 20456745 is 54765402.

It is not a de Polignac number, because 20456745 - 2⁵ = 20456713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20456747) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 498925 + ... + 498965.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^20456745 is an apocalyptic number.

It is an amenable number.

20456745 is a deficient number, since it is larger than the sum of its proper divisors (16315095).

20456745 is a wasteful number, since it uses less digits than its factorization.

20456745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146.

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 20456745 is about 4522.9133310290. The cubic root of 20456745 is about 273.4925562825.

The spelling of 20456745 in words is "twenty million, four hundred fifty-six thousand, seven hundred forty-five".