20545406064 has 60 divisors (see below), whose sum is σ = 57701891416. Its totient is φ = 6824255616.

The previous prime is 20545406047. The next prime is 20545406081. The reversal of 20545406064 is 46060454502.

20545406064 is a `hidden beast` number, since 2 + 0 + 5 + 4 + 5 + 40 + 606 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (20545406047) and next prime (20545406081).

It is a super-2 number, since 2×20545406064² (a number of 21 digits) contains 22 as substring.

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211327 + ... + 292830.

Almost surely, 2^20545406064 is an apocalyptic number.

20545406064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20545406064 is an abundant number, since it is smaller than the sum of its proper divisors (37156485352).

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

20545406064 is a wasteful number, since it uses less digits than its factorization.

20545406064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504454 (or 504445 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 20545406064 in words is "twenty billion, five hundred forty-five million, four hundred six thousand, sixty-four".