20639330 has 8 divisors (see below), whose sum is σ = 37150812. Its totient is φ = 8255728.

The previous prime is 20639327. The next prime is 20639341. The reversal of 20639330 is 3393602.

It can be written as a sum of positive squares in 2 ways, for example, as 17330569 + 3308761 = 4163^2 + 1819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20639330.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031957 + ... + 1031976.

Almost surely, 2^20639330 is an apocalyptic number.

20639330 is a deficient number, since it is larger than the sum of its proper divisors (16511482).

20639330 is a wasteful number, since it uses less digits than its factorization.

20639330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063940.

The product of its (nonzero) digits is 2916, while the sum is 26.

The square root of 20639330 is about 4543.0529382784. The cubic root of 20639330 is about 274.3038258698.

The spelling of 20639330 in words is "twenty million, six hundred thirty-nine thousand, three hundred thirty".