20606091 has 32 divisors (see below), whose sum is σ = 33136128. Its totient is φ = 11235840.

The previous prime is 20606083. The next prime is 20606099. The reversal of 20606091 is 19060602.

It is an interprime number because it is at equal distance from previous prime (20606083) and next prime (20606099).

It is not a de Polignac number, because 20606091 - 2³ = 20606083 is a prime.

It is a super-2 number, since 2×20606091² = 849221972600562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20606099) 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 31 ways as a sum of consecutive naturals, for example, 12105 + ... + 13701.

It is an arithmetic number, because the mean of its divisors is an integer number (1035504).

Almost surely, 2^20606091 is an apocalyptic number.

20606091 is a deficient number, since it is larger than the sum of its proper divisors (12530037).

20606091 is a wasteful number, since it uses less digits than its factorization.

20606091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20606091 is about 4539.3932413925. The cubic root of 20606091 is about 274.1564941528.

Adding to 20606091 its reverse (19060602), we get a palindrome (39666693).

The spelling of 20606091 in words is "twenty million, six hundred six thousand, ninety-one".