20629151 has 4 divisors (see below), whose sum is σ = 20644512. Its totient is φ = 20613792.

The previous prime is 20629127. The next prime is 20629153. The reversal of 20629151 is 15192602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20629151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20629151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20629153) 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, 5450 + ... + 8423.

It is an arithmetic number, because the mean of its divisors is an integer number (5161128).

Almost surely, 2^20629151 is an apocalyptic number.

20629151 is a deficient number, since it is larger than the sum of its proper divisors (15361).

20629151 is a wasteful number, since it uses less digits than its factorization.

20629151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15360.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 20629151 is about 4541.9325182129. The cubic root of 20629151 is about 274.2587243124.

The spelling of 20629151 in words is "twenty million, six hundred twenty-nine thousand, one hundred fifty-one".