20321147 has 8 divisors (see below), whose sum is σ = 25335552. Its totient is φ = 15834600.

The previous prime is 20321131. The next prime is 20321149. The reversal of 20321147 is 74112302.

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 20321147 - 2⁴ = 20321131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20321149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131879 + ... + 132032.

It is an arithmetic number, because the mean of its divisors is an integer number (3166944).

Almost surely, 2^20321147 is an apocalyptic number.

20321147 is a deficient number, since it is larger than the sum of its proper divisors (5014405).

20321147 is a wasteful number, since it uses less digits than its factorization.

20321147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263929.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20321147 is about 4507.8982907781. The cubic root of 20321147 is about 272.8869322953.

Adding to 20321147 its reverse (74112302), we get a palindrome (94433449).

The spelling of 20321147 in words is "twenty million, three hundred twenty-one thousand, one hundred forty-seven".