30020639 has 8 divisors (see below), whose sum is σ = 33447168. Its totient is φ = 26710360.

The previous prime is 30020621. The next prime is 30020659. The reversal of 30020639 is 93602003.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 30020639 - 2⁸ = 30020383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30020659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28517 + ... + 29550.

It is an arithmetic number, because the mean of its divisors is an integer number (4180896).

Almost surely, 2^30020639 is an apocalyptic number.

30020639 is a deficient number, since it is larger than the sum of its proper divisors (3426529).

30020639 is a wasteful number, since it uses less digits than its factorization.

30020639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58125.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 30020639 is about 5479.1093254287. The cubic root of 30020639 is about 310.7944900074.

The spelling of 30020639 in words is "thirty million, twenty thousand, six hundred thirty-nine".