20576065840 has 40 divisors (see below), whose sum is σ = 52188387408. Its totient is φ = 7482205440.

The previous prime is 20576065817. The next prime is 20576065843. The reversal of 20576065840 is 4856067502.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (20576065843) 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 in 7 ways as a sum of consecutive naturals, for example, 11690067 + ... + 11691826.

Almost surely, 2^20576065840 is an apocalyptic number.

20576065840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20576065840 is an abundant number, since it is smaller than the sum of its proper divisors (31612321568).

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

20576065840 is a wasteful number, since it uses less digits than its factorization.

20576065840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23381917 (or 23381911 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 20576065840 in words is "twenty billion, five hundred seventy-six million, sixty-five thousand, eight hundred forty".