20930609 has 16 divisors (see below), whose sum is σ = 25322880. Its totient is φ = 16899840.

The previous prime is 20930603. The next prime is 20930617. The reversal of 20930609 is 90603902.

It is a cyclic number.

It is not a de Polignac number, because 20930609 - 2⁴ = 20930593 is a prime.

It is a super-2 number, since 2×20930609² = 876180786221762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20930603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31727 + ... + 32379.

It is an arithmetic number, because the mean of its divisors is an integer number (1582680).

Almost surely, 2^20930609 is an apocalyptic number.

It is an amenable number.

20930609 is a deficient number, since it is larger than the sum of its proper divisors (4392271).

20930609 is a wasteful number, since it uses less digits than its factorization.

20930609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 20930609 is about 4574.9982513658. The cubic root of 20930609 is about 275.5882021445.

The spelling of 20930609 in words is "twenty million, nine hundred thirty thousand, six hundred nine".