20642242442 has 4 divisors (see below), whose sum is σ = 30963363666. Its totient is φ = 10321121220.

The previous prime is 20642242441. The next prime is 20642242483. The reversal of 20642242442 is 24424224602.

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., 20629289641 + 12952801 = 143629^2 + 3599^2 .

It is a super-2 number, since 2×20642242442² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20642242399 and 20642242408.

It is not an unprimeable number, because it can be changed into a prime (20642242441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5160560609 + ... + 5160560612.

Almost surely, 2^20642242442 is an apocalyptic number.

20642242442 is a deficient number, since it is larger than the sum of its proper divisors (10321121224).

20642242442 is a wasteful number, since it uses less digits than its factorization.

20642242442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10321121223.

The product of its (nonzero) digits is 49152, while the sum is 32.

The spelling of 20642242442 in words is "twenty billion, six hundred forty-two million, two hundred forty-two thousand, four hundred forty-two".