20689330 has 16 divisors (see below), whose sum is σ = 37352664. Its totient is φ = 8250880.

The previous prime is 20689313. The next prime is 20689343. The reversal of 20689330 is 3398602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15311569 + 5377761 = 3913^2 + 2319^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20689292 and 20689301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 600 + ... + 6460.

Almost surely, 2^20689330 is an apocalyptic number.

20689330 is a deficient number, since it is larger than the sum of its proper divisors (16663334).

20689330 is a wasteful number, since it uses less digits than its factorization.

20689330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6221.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20689330 is about 4548.5525170102. The cubic root of 20689330 is about 274.5251529976.

The spelling of 20689330 in words is "twenty million, six hundred eighty-nine thousand, three hundred thirty".