20435946642 has 24 divisors (see below), whose sum is σ = 44775392220. Its totient is φ = 6735442560.

The previous prime is 20435946631. The next prime is 20435946673. The reversal of 20435946642 is 24664953402.

It can be written as a sum of positive squares in 2 ways, for example, as 14771728521 + 5664218121 = 121539^2 + 75261^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6376659 + ... + 6379862.

Almost surely, 2^20435946642 is an apocalyptic number.

20435946642 is an abundant number, since it is smaller than the sum of its proper divisors (24339445578).

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

20435946642 is a wasteful number, since it uses less digits than its factorization.

20435946642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12756618 (or 12756615 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

It can be divided in two parts, 204359 and 46642, that added together give a square (251001 = 501²).

The spelling of 20435946642 in words is "twenty billion, four hundred thirty-five million, nine hundred forty-six thousand, six hundred forty-two".