20627557 has 2 divisors, whose sum is σ = 20627558. Its totient is φ = 20627556.

The previous prime is 20627549. The next prime is 20627569. The reversal of 20627557 is 75572602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18395521 + 2232036 = 4289^2 + 1494^2 .

It is a cyclic number.

It is not a de Polignac number, because 20627557 - 2³ = 20627549 is a prime.

It is a super-2 number, since 2×20627557² = 850992215576498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20628557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10313778 + 10313779.

It is an arithmetic number, because the mean of its divisors is an integer number (10313779).

Almost surely, 2^20627557 is an apocalyptic number.

It is an amenable number.

20627557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20627557 is an equidigital number, since it uses as much as digits as its factorization.

20627557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 20627557 is about 4541.7570388562. The cubic root of 20627557 is about 274.2516602041.

The spelling of 20627557 in words is "twenty million, six hundred twenty-seven thousand, five hundred fifty-seven".