20657135 has 16 divisors (see below), whose sum is σ = 25898400. Its totient is φ = 15797376.

The previous prime is 20657107. The next prime is 20657141. The reversal of 20657135 is 53175602.

It is a cyclic number.

It is not a de Polignac number, because 20657135 - 2¹⁴ = 20640751 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 20657098 and 20657107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15152 + ... + 16458.

It is an arithmetic number, because the mean of its divisors is an integer number (1618650).

Almost surely, 2^20657135 is an apocalyptic number.

20657135 is a deficient number, since it is larger than the sum of its proper divisors (5241265).

20657135 is a wasteful number, since it uses less digits than its factorization.

20657135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 20657135 is about 4545.0121011940. The cubic root of 20657135 is about 274.3826813990.

The spelling of 20657135 in words is "twenty million, six hundred fifty-seven thousand, one hundred thirty-five".