20642611 has 8 divisors (see below), whose sum is σ = 22837248. Its totient is φ = 18501000.

The previous prime is 20642603. The next prime is 20642627. The reversal of 20642611 is 11624602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20642611 - 2³ = 20642603 is a prime.

It is a super-2 number, since 2×20642611² = 852234777794642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20642651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12435 + ... + 13996.

It is an arithmetic number, because the mean of its divisors is an integer number (2854656).

Almost surely, 2^20642611 is an apocalyptic number.

20642611 is a deficient number, since it is larger than the sum of its proper divisors (2194637).

20642611 is a wasteful number, since it uses less digits than its factorization.

20642611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26513.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20642611 is about 4543.4140247175. The cubic root of 20642611 is about 274.3183603075.

Subtracting from 20642611 its reverse (11624602), we obtain a square (9018009 = 3003²).

The spelling of 20642611 in words is "twenty million, six hundred forty-two thousand, six hundred eleven".