20657427 has 32 divisors (see below), whose sum is σ = 34590720. Its totient is φ = 10692000.

The previous prime is 20657423. The next prime is 20657437. The reversal of 20657427 is 72475602.

It is not a de Polignac number, because 20657427 - 2² = 20657423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20657423) 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, 8052 + ... + 10302.

It is an arithmetic number, because the mean of its divisors is an integer number (1080960).

Almost surely, 2^20657427 is an apocalyptic number.

20657427 is a deficient number, since it is larger than the sum of its proper divisors (13933293).

20657427 is a wasteful number, since it uses less digits than its factorization.

20657427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303.

The product of its (nonzero) digits is 23520, while the sum is 33.

The square root of 20657427 is about 4545.0442242073. The cubic root of 20657427 is about 274.3839742431.

The spelling of 20657427 in words is "twenty million, six hundred fifty-seven thousand, four hundred twenty-seven".