20522091993 has 24 divisors (see below), whose sum is σ = 29643558048. Its totient is φ = 12623000832.

The previous prime is 20522091991. The next prime is 20522092037. The reversal of 20522091993 is 39919022502.

It is not a de Polignac number, because 20522091993 - 2¹ = 20522091991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20522091991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1217046 + ... + 1233792.

It is an arithmetic number, because the mean of its divisors is an integer number (1235148252).

Almost surely, 2^20522091993 is an apocalyptic number.

It is an amenable number.

20522091993 is a deficient number, since it is larger than the sum of its proper divisors (9121466055).

20522091993 is a wasteful number, since it uses less digits than its factorization.

20522091993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19193 (or 19180 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 42.

The spelling of 20522091993 in words is "twenty billion, five hundred twenty-two million, ninety-one thousand, nine hundred ninety-three".