20145487 has 2 divisors, whose sum is σ = 20145488. Its totient is φ = 20145486.

The previous prime is 20145449. The next prime is 20145509. The reversal of 20145487 is 78454102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20145487 - 2²³ = 11756879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20145407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072743 + 10072744.

It is an arithmetic number, because the mean of its divisors is an integer number (10072744).

Almost surely, 2^20145487 is an apocalyptic number.

20145487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145487 is an equidigital number, since it uses as much as digits as its factorization.

20145487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 20145487 is about 4488.3724221593. The cubic root of 20145487 is about 272.0983595758.

Adding to 20145487 its reverse (78454102), we get a palindrome (98599589).

The spelling of 20145487 in words is "twenty million, one hundred forty-five thousand, four hundred eighty-seven".