20694677940 has 288 divisors, whose sum is σ = 66606059520. Its totient is φ = 5194119168.

The previous prime is 20694677917. The next prime is 20694677951. The reversal of 20694677940 is 4977649602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 36369976 + ... + 36370544.

It is an arithmetic number, because the mean of its divisors is an integer number (231271040).

Almost surely, 2^20694677940 is an apocalyptic number.

20694677940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20694677940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33303029760).

20694677940 is an abundant number, since it is smaller than the sum of its proper divisors (45911381580).

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

20694677940 is a wasteful number, since it uses less digits than its factorization.

20694677940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 20694677940 in words is "twenty billion, six hundred ninety-four million, six hundred seventy-seven thousand, nine hundred forty".