20609207736 has 64 divisors (see below), whose sum is σ = 58406678400. Its totient is φ = 6007540608.

The previous prime is 20609207719. The next prime is 20609207747. The reversal of 20609207736 is 63770290602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1732366 + ... + 1744221.

It is an arithmetic number, because the mean of its divisors is an integer number (912604350).

Almost surely, 2^20609207736 is an apocalyptic number.

20609207736 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20609207736 is an abundant number, since it is smaller than the sum of its proper divisors (37797470664).

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

20609207736 is a wasteful number, since it uses less digits than its factorization.

20609207736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476628 (or 3476624 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 42.

The spelling of 20609207736 in words is "twenty billion, six hundred nine million, two hundred seven thousand, seven hundred thirty-six".