20021457602 has 4 divisors (see below), whose sum is σ = 30032186406. Its totient is φ = 10010728800.

The previous prime is 20021457587. The next prime is 20021457641. The reversal of 20021457602 is 20675412002.

It is a happy number.

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., 15217442881 + 4804014721 = 123359^2 + 69311^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005364399 + ... + 5005364402.

Almost surely, 2^20021457602 is an apocalyptic number.

20021457602 is a deficient number, since it is larger than the sum of its proper divisors (10010728804).

20021457602 is a wasteful number, since it uses less digits than its factorization.

20021457602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10010728803.

The product of its (nonzero) digits is 6720, while the sum is 29.

Adding to 20021457602 its reverse (20675412002), we get a palindrome (40696869604).

The spelling of 20021457602 in words is "twenty billion, twenty-one million, four hundred fifty-seven thousand, six hundred two".