20464705 has 4 divisors (see below), whose sum is σ = 24557652. Its totient is φ = 16371760.

The previous prime is 20464669. The next prime is 20464711. The reversal of 20464705 is 50746402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4592449 + 15872256 = 2143^2 + 3984^2 .

It is not a de Polignac number, because 20464705 - 2⁹ = 20464193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2046466 + ... + 2046475.

It is an arithmetic number, because the mean of its divisors is an integer number (6139413).

Almost surely, 2^20464705 is an apocalyptic number.

It is an amenable number.

20464705 is a deficient number, since it is larger than the sum of its proper divisors (4092947).

20464705 is an equidigital number, since it uses as much as digits as its factorization.

20464705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092946.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20464705 is about 4523.7932092438. The cubic root of 20464705 is about 273.5280249171.

The spelling of 20464705 in words is "twenty million, four hundred sixty-four thousand, seven hundred five".