20511677040 has 40 divisors (see below), whose sum is σ = 63586199568. Its totient is φ = 5469780480.

The previous prime is 20511677033. The next prime is 20511677047. The reversal of 20511677040 is 4077611502.

It is an interprime number because it is at equal distance from previous prime (20511677033) and next prime (20511677047).

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

It is a junction number, because it is equal to n+sod(n) for n = 20511676992 and 20511677010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511677047) 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, 42732421 + ... + 42732900.

Almost surely, 2^20511677040 is an apocalyptic number.

20511677040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20511677040 is an abundant number, since it is smaller than the sum of its proper divisors (43074522528).

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

20511677040 is a wasteful number, since it uses less digits than its factorization.

20511677040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85465337 (or 85465331 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The spelling of 20511677040 in words is "twenty billion, five hundred eleven million, six hundred seventy-seven thousand, forty".