20512220663 has 24 divisors (see below), whose sum is σ = 23753367936. Its totient is φ = 17533643600.

The previous prime is 20512220653. The next prime is 20512220681. The reversal of 20512220663 is 36602221502.

It is not a de Polignac number, because 20512220663 - 2¹⁰ = 20512219639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512220623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 869048 + ... + 892338.

It is an arithmetic number, because the mean of its divisors is an integer number (989723664).

Almost surely, 2^20512220663 is an apocalyptic number.

20512220663 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20512220663 is a deficient number, since it is larger than the sum of its proper divisors (3241147273).

20512220663 is a wasteful number, since it uses less digits than its factorization.

20512220663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23443 (or 23384 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 20512220663 in words is "twenty billion, five hundred twelve million, two hundred twenty thousand, six hundred sixty-three".