20642627 has 2 divisors, whose sum is σ = 20642628. Its totient is φ = 20642626.

The previous prime is 20642603. The next prime is 20642647. The reversal of 20642627 is 72624602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20642627 - 2⁶ = 20642563 is a prime.

It is a super-2 number, since 2×20642627² = 852236098922258, which contains 22 as substring.

It is equal to p_1308737 and since 20642627 and 1308737 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20642627.

It is not a weakly prime, because it can be changed into another prime (20642647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10321313 + 10321314.

It is an arithmetic number, because the mean of its divisors is an integer number (10321314).

Almost surely, 2^20642627 is an apocalyptic number.

20642627 is a deficient number, since it is larger than the sum of its proper divisors (1).

20642627 is an equidigital number, since it uses as much as digits as its factorization.

20642627 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 20642627 is about 4543.4157855076. The cubic root of 20642627 is about 274.3184311818.

The spelling of 20642627 in words is "twenty million, six hundred forty-two thousand, six hundred twenty-seven".