20740830 has 32 divisors (see below), whose sum is σ = 54304128. Its totient is φ = 5028000.

The previous prime is 20740823. The next prime is 20740849. The reversal of 20740830 is 3804702.

It is a self number, because there is not a number n which added to its sum of digits gives 20740830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31096 + ... + 31755.

It is an arithmetic number, because the mean of its divisors is an integer number (1697004).

Almost surely, 2^20740830 is an apocalyptic number.

20740830 is an abundant number, since it is smaller than the sum of its proper divisors (33563298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20740830 is a wasteful number, since it uses less digits than its factorization.

20740830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62872.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20740830 is about 4554.2101400792. The cubic root of 20740830 is about 274.7527474588.

The spelling of 20740830 in words is "twenty million, seven hundred forty thousand, eight hundred thirty".