20587451 has 2 divisors, whose sum is σ = 20587452. Its totient is φ = 20587450.

The previous prime is 20587447. The next prime is 20587487. The reversal of 20587451 is 15478502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20587451 - 2² = 20587447 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20587421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10293725 + 10293726.

It is an arithmetic number, because the mean of its divisors is an integer number (10293726).

Almost surely, 2^20587451 is an apocalyptic number.

20587451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20587451 is an equidigital number, since it uses as much as digits as its factorization.

20587451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 20587451 is about 4537.3396390396. The cubic root of 20587451 is about 274.0738030895.

The spelling of 20587451 in words is "twenty million, five hundred eighty-seven thousand, four hundred fifty-one".