20847953 has 8 divisors (see below), whose sum is σ = 23873472. Its totient is φ = 17834256.

The previous prime is 20847949. The next prime is 20847971. The reversal of 20847953 is 35974802.

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

It is a cyclic number.

It is not a de Polignac number, because 20847953 - 2² = 20847949 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20847923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1226 + ... + 6572.

It is an arithmetic number, because the mean of its divisors is an integer number (2984184).

Almost surely, 2^20847953 is an apocalyptic number.

It is an amenable number.

20847953 is a deficient number, since it is larger than the sum of its proper divisors (3025519).

20847953 is an equidigital number, since it uses as much as digits as its factorization.

20847953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5911.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20847953 is about 4565.9558692567. The cubic root of 20847953 is about 275.2249531257.

The spelling of 20847953 in words is "twenty million, eight hundred forty-seven thousand, nine hundred fifty-three".