20648451 has 4 divisors (see below), whose sum is σ = 27531272. Its totient is φ = 13765632.

The previous prime is 20648443. The next prime is 20648477. The reversal of 20648451 is 15484602.

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

It is not a de Polignac number, because 20648451 - 2³ = 20648443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20648401) 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, 3441406 + ... + 3441411.

It is an arithmetic number, because the mean of its divisors is an integer number (6882818).

Almost surely, 2^20648451 is an apocalyptic number.

20648451 is a deficient number, since it is larger than the sum of its proper divisors (6882821).

20648451 is an equidigital number, since it uses as much as digits as its factorization.

20648451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6882820.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 20648451 is about 4544.0566677805. The cubic root of 20648451 is about 274.3442269993.

The spelling of 20648451 in words is "twenty million, six hundred forty-eight thousand, four hundred fifty-one".