20142591 has 16 divisors (see below), whose sum is σ = 31684608. Its totient is φ = 11138400.

The previous prime is 20142583. The next prime is 20142593. The reversal of 20142591 is 19524102.

It is not a de Polignac number, because 20142591 - 2³ = 20142583 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20142593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14820 + ... + 16121.

It is an arithmetic number, because the mean of its divisors is an integer number (1980288).

Almost surely, 2^20142591 is an apocalyptic number.

20142591 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20142591 is a deficient number, since it is larger than the sum of its proper divisors (11542017).

20142591 is a wasteful number, since it uses less digits than its factorization.

20142591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30982.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 20142591 is about 4488.0497991890. The cubic root of 20142591 is about 272.0853205163.

Adding to 20142591 its reverse (19524102), we get a palindrome (39666693).

The spelling of 20142591 in words is "twenty million, one hundred forty-two thousand, five hundred ninety-one".