20445521142 has 16 divisors (see below), whose sum is σ = 40938655680. Its totient is φ = 6807238152.

The previous prime is 20445521111. The next prime is 20445521143. The reversal of 20445521142 is 24112554402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445521143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1978308 + ... + 1988615.

It is an arithmetic number, because the mean of its divisors is an integer number (2558665980).

Almost surely, 2^20445521142 is an apocalyptic number.

20445521142 is an abundant number, since it is smaller than the sum of its proper divisors (20493134538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20445521142 is a wasteful number, since it uses less digits than its factorization.

20445521142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967787.

The product of its (nonzero) digits is 12800, while the sum is 30.

The spelling of 20445521142 in words is "twenty billion, four hundred forty-five million, five hundred twenty-one thousand, one hundred forty-two".