20691141 has 16 divisors (see below), whose sum is σ = 28174848. Its totient is φ = 13503600.

The previous prime is 20691137. The next prime is 20691149. The reversal of 20691141 is 14119602.

It is not a de Polignac number, because 20691141 - 2² = 20691137 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20691149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62346 + ... + 62676.

It is an arithmetic number, because the mean of its divisors is an integer number (1760928).

Almost surely, 2^20691141 is an apocalyptic number.

It is an amenable number.

20691141 is a deficient number, since it is larger than the sum of its proper divisors (7483707).

20691141 is a wasteful number, since it uses less digits than its factorization.

20691141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 20691141 is about 4548.7515869742. The cubic root of 20691141 is about 274.5331627712.

The spelling of 20691141 in words is "twenty million, six hundred ninety-one thousand, one hundred forty-one".