20305551534 has 16 divisors (see below), whose sum is σ = 41276859600. Its totient is φ = 6657557760.

The previous prime is 20305551533. The next prime is 20305551559. The reversal of 20305551534 is 43515550302.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20305551495 and 20305551504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305551533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27739459 + ... + 27740190.

It is an arithmetic number, because the mean of its divisors is an integer number (2579803725).

Almost surely, 2^20305551534 is an apocalyptic number.

20305551534 is an abundant number, since it is smaller than the sum of its proper divisors (20971308066).

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

20305551534 is a wasteful number, since it uses less digits than its factorization.

20305551534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55479715.

The product of its (nonzero) digits is 45000, while the sum is 33.

The spelling of 20305551534 in words is "twenty billion, three hundred five million, five hundred fifty-one thousand, five hundred thirty-four".