20454745 has 16 divisors (see below), whose sum is σ = 25118208. Its totient is φ = 15986880.

The previous prime is 20454739. The next prime is 20454803. The reversal of 20454745 is 54745402.

It is not a de Polignac number, because 20454745 - 2⁹ = 20454233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55552 + ... + 55918.

It is an arithmetic number, because the mean of its divisors is an integer number (1569888).

Almost surely, 2^20454745 is an apocalyptic number.

It is an amenable number.

20454745 is a deficient number, since it is larger than the sum of its proper divisors (4663463).

20454745 is a wasteful number, since it uses less digits than its factorization.

20454745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600.

The product of its (nonzero) digits is 22400, while the sum is 31.

The square root of 20454745 is about 4522.6922291927. The cubic root of 20454745 is about 273.4836431189.

The spelling of 20454745 in words is "twenty million, four hundred fifty-four thousand, seven hundred forty-five".