20645456534 has 8 divisors (see below), whose sum is σ = 31141191960. Its totient is φ = 10265059216.

The previous prime is 20645456509. The next prime is 20645456549. The reversal of 20645456534 is 43565454602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28834079 + ... + 28834794.

It is an arithmetic number, because the mean of its divisors is an integer number (3892648995).

Almost surely, 2^20645456534 is an apocalyptic number.

20645456534 is a deficient number, since it is larger than the sum of its proper divisors (10495735426).

20645456534 is a wasteful number, since it uses less digits than its factorization.

20645456534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57669054.

The product of its (nonzero) digits is 1728000, while the sum is 44.

The spelling of 20645456534 in words is "twenty billion, six hundred forty-five million, four hundred fifty-six thousand, five hundred thirty-four".