20209139712 has 306 divisors, whose sum is σ = 61913746128. Its totient is φ = 6593052672.

The previous prime is 20209139711. The next prime is 20209139729. The reversal of 20209139712 is 21793190202.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20209139711) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 429981673 + ... + 429981719.

Almost surely, 2^20209139712 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 20209139712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30956873064).

20209139712 is an abundant number, since it is smaller than the sum of its proper divisors (41704606416).

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

20209139712 is an frugal number, since it uses more digits than its factorization.

20209139712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

It can be divided in two parts, 2020913 and 9712, that added together give a square (2030625 = 1425²).

The spelling of 20209139712 in words is "twenty billion, two hundred nine million, one hundred thirty-nine thousand, seven hundred twelve".