20629091 has 16 divisors (see below), whose sum is σ = 25273344. Its totient is φ = 16451424.

The previous prime is 20629073. The next prime is 20629097. The reversal of 20629091 is 19092602.

It is a cyclic number.

It is not a de Polignac number, because 20629091 - 2²² = 16434787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20629097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4226 + ... + 7688.

It is an arithmetic number, because the mean of its divisors is an integer number (1579584).

Almost surely, 2^20629091 is an apocalyptic number.

20629091 is a deficient number, since it is larger than the sum of its proper divisors (4644253).

20629091 is a wasteful number, since it uses less digits than its factorization.

20629091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3530.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 20629091 is about 4541.9259130902. The cubic root of 20629091 is about 274.2584584178.

The spelling of 20629091 in words is "twenty million, six hundred twenty-nine thousand, ninety-one".