20145420788 has 6 divisors (see below), whose sum is σ = 35254486386. Its totient is φ = 10072710392.

The previous prime is 20145420781. The next prime is 20145420793. The reversal of 20145420788 is 88702454102.

It can be written as a sum of positive squares in only one way, i.e., 19873104784 + 272316004 = 140972^2 + 16502^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145420781) by changing a digit.

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, 2518177595 + ... + 2518177602.

It is an arithmetic number, because the mean of its divisors is an integer number (5875747731).

Almost surely, 2^20145420788 is an apocalyptic number.

It is an amenable number.

20145420788 is a deficient number, since it is larger than the sum of its proper divisors (15109065598).

20145420788 is a wasteful number, since it uses less digits than its factorization.

20145420788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5036355201 (or 5036355199 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 41.

The spelling of 20145420788 in words is "twenty billion, one hundred forty-five million, four hundred twenty thousand, seven hundred eighty-eight".