20021145534 has 24 divisors (see below), whose sum is σ = 46716006792. Its totient is φ = 6160352400.

The previous prime is 20021145523. The next prime is 20021145553. The reversal of 20021145534 is 43554112002.

20021145534 is a `hidden beast` number, since 200 + 2 + 1 + 1 + 455 + 3 + 4 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20021145498 and 20021145507.

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, 42779992 + ... + 42780459.

It is an arithmetic number, because the mean of its divisors is an integer number (1946500283).

Almost surely, 2^20021145534 is an apocalyptic number.

20021145534 is an abundant number, since it is smaller than the sum of its proper divisors (26694861258).

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

20021145534 is a wasteful number, since it uses less digits than its factorization.

20021145534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85560472 (or 85560469 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 20021145534 its reverse (43554112002), we get a palindrome (63575257536).

The spelling of 20021145534 in words is "twenty billion, twenty-one million, one hundred forty-five thousand, five hundred thirty-four".