20629609 has 32 divisors (see below), whose sum is σ = 28498176. Its totient is φ = 14411520.

The previous prime is 20629607. The next prime is 20629613. The reversal of 20629609 is 90692602.

It is a cyclic number.

It is not a de Polignac number, because 20629609 - 2¹ = 20629607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20629603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36759 + ... + 37315.

It is an arithmetic number, because the mean of its divisors is an integer number (890568).

Almost surely, 2^20629609 is an apocalyptic number.

It is an amenable number.

20629609 is a deficient number, since it is larger than the sum of its proper divisors (7868567).

20629609 is a wasteful number, since it uses less digits than its factorization.

20629609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20629609 is about 4541.9829370001. The cubic root of 20629609 is about 274.2607539575.

The spelling of 20629609 in words is "twenty million, six hundred twenty-nine thousand, six hundred nine".