20420442402 has 16 divisors (see below), whose sum is σ = 40848649920. Its totient is φ = 6805519952.

The previous prime is 20420442391. The next prime is 20420442421. The reversal of 20420442402 is 20424402402.

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, 289077 + ... + 352712.

It is an arithmetic number, because the mean of its divisors is an integer number (2553040620).

Almost surely, 2^20420442402 is an apocalyptic number.

20420442402 is an abundant number, since it is smaller than the sum of its proper divisors (20428207518).

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

20420442402 is a wasteful number, since it uses less digits than its factorization.

20420442402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647097.

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 20420442402 its reverse (20424402402), we get a palindrome (40844844804).

The spelling of 20420442402 in words is "twenty billion, four hundred twenty million, four hundred forty-two thousand, four hundred two".