20121854562 has 12 divisors (see below), whose sum is σ = 43597351590. Its totient is φ = 6707284848.

The previous prime is 20121854531. The next prime is 20121854579. The reversal of 20121854562 is 26545812102.

20121854562 is a `hidden beast` number, since 2 + 0 + 12 + 1 + 85 + 4 + 562 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16545934161 + 3575920401 = 128631^2 + 59799^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 558940387 + ... + 558940422.

Almost surely, 2^20121854562 is an apocalyptic number.

20121854562 is an abundant number, since it is smaller than the sum of its proper divisors (23475497028).

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

20121854562 is a wasteful number, since it uses less digits than its factorization.

20121854562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117880817 (or 1117880814 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 20121854562 in words is "twenty billion, one hundred twenty-one million, eight hundred fifty-four thousand, five hundred sixty-two".