20142547 has 2 divisors, whose sum is σ = 20142548. Its totient is φ = 20142546.

The previous prime is 20142517. The next prime is 20142553. The reversal of 20142547 is 74524102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20142547 - 2¹⁵ = 20109779 is a prime.

It is not a weakly prime, because it can be changed into another prime (20142517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071273 + 10071274.

It is an arithmetic number, because the mean of its divisors is an integer number (10071274).

Almost surely, 2^20142547 is an apocalyptic number.

20142547 is a deficient number, since it is larger than the sum of its proper divisors (1).

20142547 is an equidigital number, since it uses as much as digits as its factorization.

20142547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 20142547 is about 4488.0448972799. The cubic root of 20142547 is about 272.0851223994.

Adding to 20142547 its reverse (74524102), we get a palindrome (94666649).

The spelling of 20142547 in words is "twenty million, one hundred forty-two thousand, five hundred forty-seven".