20435037672 has 128 divisors (see below), whose sum is σ = 59786588160. Its totient is φ = 5700119040.

The previous prime is 20435037671. The next prime is 20435037703. The reversal of 20435037672 is 27673053402.

It is a self number, because there is not a number n which added to its sum of digits gives 20435037672.

It is not an unprimeable number, because it can be changed into a prime (20435037671) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1220268 + ... + 1236900.

It is an arithmetic number, because the mean of its divisors is an integer number (467082720).

Almost surely, 2^20435037672 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 20435037672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29893294080).

20435037672 is an abundant number, since it is smaller than the sum of its proper divisors (39351550488).

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

20435037672 is a wasteful number, since it uses less digits than its factorization.

20435037672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16823 (or 16819 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 39.

The spelling of 20435037672 in words is "twenty billion, four hundred thirty-five million, thirty-seven thousand, six hundred seventy-two".