20420724830 has 16 divisors (see below), whose sum is σ = 40098878064. Its totient is φ = 7425718080.

The previous prime is 20420724817. The next prime is 20420724839. The reversal of 20420724830 is 3842702402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420724839) 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, 92821367 + ... + 92821586.

It is an arithmetic number, because the mean of its divisors is an integer number (2506179879).

Almost surely, 2^20420724830 is an apocalyptic number.

20420724830 is a deficient number, since it is larger than the sum of its proper divisors (19678153234).

20420724830 is a wasteful number, since it uses less digits than its factorization.

20420724830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185642971.

The product of its (nonzero) digits is 21504, while the sum is 32.

The spelling of 20420724830 in words is "twenty billion, four hundred twenty million, seven hundred twenty-four thousand, eight hundred thirty".