20681704940 has 24 divisors (see below), whose sum is σ = 46772471760. Its totient is φ = 7636321728.

The previous prime is 20681704933. The next prime is 20681704951. The reversal of 20681704940 is 4940718602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39772250 + ... + 39772769.

It is an arithmetic number, because the mean of its divisors is an integer number (1948852990).

Almost surely, 2^20681704940 is an apocalyptic number.

20681704940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20681704940 is an abundant number, since it is smaller than the sum of its proper divisors (26090766820).

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

20681704940 is a wasteful number, since it uses less digits than its factorization.

20681704940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79545041 (or 79545039 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 20681704940 in words is "twenty billion, six hundred eighty-one million, seven hundred four thousand, nine hundred forty".