20986151 has 2 divisors, whose sum is σ = 20986152. Its totient is φ = 20986150.

The previous prime is 20986117. The next prime is 20986153. The reversal of 20986151 is 15168902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20986151 - 2¹⁰ = 20985127 is a prime.

Together with 20986153, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20986153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10493075 + 10493076.

It is an arithmetic number, because the mean of its divisors is an integer number (10493076).

Almost surely, 2^20986151 is an apocalyptic number.

20986151 is a deficient number, since it is larger than the sum of its proper divisors (1).

20986151 is an equidigital number, since it uses as much as digits as its factorization.

20986151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 20986151 is about 4581.0643959674. The cubic root of 20986151 is about 275.8317561410.

The spelling of 20986151 in words is "twenty million, nine hundred eighty-six thousand, one hundred fifty-one".