20313745 has 4 divisors (see below), whose sum is σ = 24376500. Its totient is φ = 16250992.

The previous prime is 20313743. The next prime is 20313749. The reversal of 20313745 is 54731302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54731302 = 2 ⋅27365651.

It can be written as a sum of positive squares in 2 ways, for example, as 2999824 + 17313921 = 1732^2 + 4161^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313745 - 2¹ = 20313743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20313743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2031370 + ... + 2031379.

It is an arithmetic number, because the mean of its divisors is an integer number (6094125).

Almost surely, 2^20313745 is an apocalyptic number.

It is an amenable number.

20313745 is a deficient number, since it is larger than the sum of its proper divisors (4062755).

20313745 is an equidigital number, since it uses as much as digits as its factorization.

20313745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062754.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20313745 is about 4507.0772125625. The cubic root of 20313745 is about 272.8537951504.

It can be divided in two parts, 2031 and 3745, that added together give a square (5776 = 76²).

The spelling of 20313745 in words is "twenty million, three hundred thirteen thousand, seven hundred forty-five".