20541611664 has 200 divisors, whose sum is σ = 71523467840. Its totient is φ = 5560088832.

The previous prime is 20541611647. The next prime is 20541611707. The reversal of 20541611664 is 46611614502.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 112782 + ... + 231954.

Almost surely, 2^20541611664 is an apocalyptic number.

20541611664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20541611664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35761733920).

20541611664 is an abundant number, since it is smaller than the sum of its proper divisors (50981856176).

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

20541611664 is a wasteful number, since it uses less digits than its factorization.

20541611664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119219 (or 119204 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 20541611664 in words is "twenty billion, five hundred forty-one million, six hundred eleven thousand, six hundred sixty-four".