20525215543542 has 24 divisors (see below), whose sum is σ = 44477335548360. Its totient is φ = 6840810021600.

The previous prime is 20525215543531. The next prime is 20525215543589. The reversal of 20525215543542 is 24534551252502.

20525215543542 is a `hidden beast` number, since 2 + 0 + 5 + 2 + 5 + 21 + 554 + 35 + 42 = 666.

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, 77238084 + ... + 77503367.

It is an arithmetic number, because the mean of its divisors is an integer number (1853222314515).

Almost surely, 2^{20525215543542} is an apocalyptic number.

20525215543542 is an abundant number, since it is smaller than the sum of its proper divisors (23952120004818).

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

20525215543542 is a wasteful number, since it uses less digits than its factorization.

20525215543542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154748828 (or 154748825 counting only the distinct ones).

The product of its (nonzero) digits is 2400000, while the sum is 45.

The spelling of 20525215543542 in words is "twenty trillion, five hundred twenty-five billion, two hundred fifteen million, five hundred forty-three thousand, five hundred forty-two".