20021541553 has 16 divisors (see below), whose sum is σ = 21892743936. Its totient is φ = 18198290880.

The previous prime is 20021541539. The next prime is 20021541557. The reversal of 20021541553 is 35514512002.

It is a cyclic number.

It is not a de Polignac number, because 20021541553 - 2³³ = 11431606961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021541557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 746451 + ... + 772807.

It is an arithmetic number, because the mean of its divisors is an integer number (1368296496).

Almost surely, 2^20021541553 is an apocalyptic number.

It is an amenable number.

20021541553 is a deficient number, since it is larger than the sum of its proper divisors (1871202383).

20021541553 is a wasteful number, since it uses less digits than its factorization.

20021541553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27264.

The product of its (nonzero) digits is 6000, while the sum is 28.

The spelling of 20021541553 in words is "twenty billion, twenty-one million, five hundred forty-one thousand, five hundred fifty-three".