20642527 has 2 divisors, whose sum is σ = 20642528. Its totient is φ = 20642526.

The previous prime is 20642521. The next prime is 20642561. The reversal of 20642527 is 72524602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20642527 is a prime.

It is a super-2 number, since 2×20642527² = 852227841891458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20642495 and 20642504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20642521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10321263 + 10321264.

It is an arithmetic number, because the mean of its divisors is an integer number (10321264).

Almost surely, 2^20642527 is an apocalyptic number.

20642527 is a deficient number, since it is larger than the sum of its proper divisors (1).

20642527 is an equidigital number, since it uses as much as digits as its factorization.

20642527 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20642527 is about 4543.4047805583. The cubic root of 20642527 is about 274.3179882167.

The spelling of 20642527 in words is "twenty million, six hundred forty-two thousand, five hundred twenty-seven".