20661523416 has 40 divisors (see below), whose sum is σ = 57871398420. Its totient is φ = 6887174256.

The previous prime is 20661523357. The next prime is 20661523423. The reversal of 20661523416 is 61432516602.

20661523416 is a `hidden beast` number, since 2 + 0 + 6 + 615 + 2 + 34 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 9 ways as a sum of consecutive naturals, for example, 15941886 + ... + 15943181.

Almost surely, 2^20661523416 is an apocalyptic number.

It is an amenable number.

20661523416 is an abundant number, since it is smaller than the sum of its proper divisors (37209875004).

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

20661523416 is a wasteful number, since it uses less digits than its factorization.

20661523416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31885085 (or 31885072 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20661523416 in words is "twenty billion, six hundred sixty-one million, five hundred twenty-three thousand, four hundred sixteen".