20311945 has 8 divisors (see below), whose sum is σ = 24413760. Its totient is φ = 16223280.

The previous prime is 20311939. The next prime is 20311979. The reversal of 20311945 is 54911302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20311945 - 2³ = 20311937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516 + ... + 6394.

It is an arithmetic number, because the mean of its divisors is an integer number (3051720).

Almost surely, 2^20311945 is an apocalyptic number.

It is an amenable number.

20311945 is a deficient number, since it is larger than the sum of its proper divisors (4101815).

20311945 is an equidigital number, since it uses as much as digits as its factorization.

20311945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6575.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20311945 is about 4506.8775221876. The cubic root of 20311945 is about 272.8457357250.

The spelling of 20311945 in words is "twenty million, three hundred eleven thousand, nine hundred forty-five".