20450947 has 4 divisors (see below), whose sum is σ = 22310136. Its totient is φ = 18591760.

The previous prime is 20450939. The next prime is 20450981. The reversal of 20450947 is 74905402.

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

It is not a de Polignac number, because 20450947 - 2³ = 20450939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20459947) 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, 929578 + ... + 929599.

It is an arithmetic number, because the mean of its divisors is an integer number (5577534).

Almost surely, 2^20450947 is an apocalyptic number.

20450947 is a deficient number, since it is larger than the sum of its proper divisors (1859189).

20450947 is a wasteful number, since it uses less digits than its factorization.

20450947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859188.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20450947 is about 4522.2723270498. The cubic root of 20450947 is about 273.4667154220.

The spelling of 20450947 in words is "twenty million, four hundred fifty thousand, nine hundred forty-seven".