20781445610 has 64 divisors (see below), whose sum is σ = 38443548672. Its totient is φ = 8085946176.

The previous prime is 20781445583. The next prime is 20781445613. The reversal of 20781445610 is 1654418702.

It is not an unprimeable number, because it can be changed into a prime (20781445613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24080039 + ... + 24080901.

It is an arithmetic number, because the mean of its divisors is an integer number (600680448).

Almost surely, 2^20781445610 is an apocalyptic number.

20781445610 is a deficient number, since it is larger than the sum of its proper divisors (17662103062).

20781445610 is a wasteful number, since it uses less digits than its factorization.

20781445610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347.

The product of its (nonzero) digits is 53760, while the sum is 38.

The spelling of 20781445610 in words is "twenty billion, seven hundred eighty-one million, four hundred forty-five thousand, six hundred ten".