20655151 has 4 divisors (see below), whose sum is σ = 22532904. Its totient is φ = 18777400.

The previous prime is 20655143. The next prime is 20655161. The reversal of 20655151 is 15155602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20655151 - 2³ = 20655143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938860 + ... + 938881.

It is an arithmetic number, because the mean of its divisors is an integer number (5633226).

Almost surely, 2^20655151 is an apocalyptic number.

20655151 is a deficient number, since it is larger than the sum of its proper divisors (1877753).

20655151 is a wasteful number, since it uses less digits than its factorization.

20655151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877752.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 20655151 is about 4544.7938347080. The cubic root of 20655151 is about 274.3738968205.

It can be divided in two parts, 206551 and 51, that added together give a palindrome (206602).

The spelling of 20655151 in words is "twenty million, six hundred fifty-five thousand, one hundred fifty-one".