20420002402 has 4 divisors (see below), whose sum is σ = 30630003606. Its totient is φ = 10210001200.

The previous prime is 20420002391. The next prime is 20420002403.

20420002402 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20243882961 + 176119441 = 142281^2 + 13271^2 .

It is not an unprimeable number, because it can be changed into a prime (20420002403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105000599 + ... + 5105000602.

Almost surely, 2^20420002402 is an apocalyptic number.

20420002402 is a deficient number, since it is larger than the sum of its proper divisors (10210001204).

20420002402 is a wasteful number, since it uses less digits than its factorization.

20420002402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210001203.

The product of its (nonzero) digits is 256, while the sum is 16.

It can be divided in two parts, 2042000 and 2402, that added together give a palindrome (2044402).

The spelling of 20420002402 in words is "twenty billion, four hundred twenty million, two thousand, four hundred two".