20686772736 has 240 divisors, whose sum is σ = 70762595904. Its totient is φ = 5910257664.

The previous prime is 20686772699. The next prime is 20686772741. The reversal of 20686772736 is 63727768602.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 859036 + ... + 882788.

Almost surely, 2^20686772736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20686772736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35381297952).

20686772736 is an abundant number, since it is smaller than the sum of its proper divisors (50075823168).

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

20686772736 is an frugal number, since it uses more digits than its factorization.

20686772736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23793 (or 23765 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 54.

The spelling of 20686772736 in words is "twenty billion, six hundred eighty-six million, seven hundred seventy-two thousand, seven hundred thirty-six".