20420222002 has 4 divisors (see below), whose sum is σ = 30630333006. Its totient is φ = 10210111000.

The previous prime is 20420221979. The next prime is 20420222057. The reversal of 20420222002 is 20022202402.

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., 19827737721 + 592484281 = 140811^2 + 24341^2 .

It is a super-2 number, since 2×20420222002² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105055499 + ... + 5105055502.

Almost surely, 2^20420222002 is an apocalyptic number.

20420222002 is a deficient number, since it is larger than the sum of its proper divisors (10210111004).

20420222002 is a wasteful number, since it uses less digits than its factorization.

20420222002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10210111003.

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

Adding to 20420222002 its reverse (20022202402), we get a palindrome (40442424404).

The spelling of 20420222002 in words is "twenty billion, four hundred twenty million, two hundred twenty-two thousand, two".