20694434432 has 64 divisors (see below), whose sum is σ = 47179324800. Its totient is φ = 8857273344.

The previous prime is 20694434401. The next prime is 20694434461. The reversal of 20694434432 is 23443449602.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 20694434432.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 677669 + ... + 707547.

It is an arithmetic number, because the mean of its divisors is an integer number (737176950).

Almost surely, 2^20694434432 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 20694434432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23589662400).

20694434432 is an abundant number, since it is smaller than the sum of its proper divisors (26484890368).

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

20694434432 is an equidigital number, since it uses as much as digits as its factorization.

20694434432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30673 (or 30661 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 41.

The spelling of 20694434432 in words is "twenty billion, six hundred ninety-four million, four hundred thirty-four thousand, four hundred thirty-two".