20979229340 has 12 divisors (see below), whose sum is σ = 44056381656. Its totient is φ = 8391691728.

The previous prime is 20979229303. The next prime is 20979229351. The reversal of 20979229340 is 4392297902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524480714 + ... + 524480753.

It is an arithmetic number, because the mean of its divisors is an integer number (3671365138).

Almost surely, 2^20979229340 is an apocalyptic number.

20979229340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20979229340 is an abundant number, since it is smaller than the sum of its proper divisors (23077152316).

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

20979229340 is a wasteful number, since it uses less digits than its factorization.

20979229340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048961476 (or 1048961474 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 20979229340 in words is "twenty billion, nine hundred seventy-nine million, two hundred twenty-nine thousand, three hundred forty".