20734005990 has 16 divisors (see below), whose sum is σ = 49761614448. Its totient is φ = 5529068256.

The previous prime is 20734005989. The next prime is 20734005997. The reversal of 20734005990 is 9950043702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20734005997) 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, 345566737 + ... + 345566796.

It is an arithmetic number, because the mean of its divisors is an integer number (3110100903).

Almost surely, 2^20734005990 is an apocalyptic number.

20734005990 is an abundant number, since it is smaller than the sum of its proper divisors (29027608458).

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

20734005990 is a wasteful number, since it uses less digits than its factorization.

20734005990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691133543.

The product of its (nonzero) digits is 68040, while the sum is 39.

The spelling of 20734005990 in words is "twenty billion, seven hundred thirty-four million, five thousand, nine hundred ninety".