20445786990 has 32 divisors (see below), whose sum is σ = 54522099360. Its totient is φ = 5452209792.

The previous prime is 20445786983. The next prime is 20445787039. The reversal of 20445786990 is 9968754402.

20445786990 is a `hidden beast` number, since 2 + 0 + 4 + 4 + 578 + 69 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37862299 + ... + 37862838.

It is an arithmetic number, because the mean of its divisors is an integer number (1703815605).

Almost surely, 2^20445786990 is an apocalyptic number.

20445786990 is an abundant number, since it is smaller than the sum of its proper divisors (34076312370).

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

20445786990 is a wasteful number, since it uses less digits than its factorization.

20445786990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75725153 (or 75725147 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 20445786990 in words is "twenty billion, four hundred forty-five million, seven hundred eighty-six thousand, nine hundred ninety".