20402218402 has 8 divisors (see below), whose sum is σ = 31933907136. Its totient is φ = 9757582692.

The previous prime is 20402218399. The next prime is 20402218423. The reversal of 20402218402 is 20481220402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221763198 + ... + 221763289.

It is an arithmetic number, because the mean of its divisors is an integer number (3991738392).

Almost surely, 2^20402218402 is an apocalyptic number.

20402218402 is a deficient number, since it is larger than the sum of its proper divisors (11531688734).

20402218402 is a wasteful number, since it uses less digits than its factorization.

20402218402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443526512.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 20402218402 its reverse (20481220402), we get a palindrome (40883438804).

The spelling of 20402218402 in words is "twenty billion, four hundred two million, two hundred eighteen thousand, four hundred two".