20291138452 has 36 divisors (see below), whose sum is σ = 38468860416. Its totient is φ = 9360817440.

The previous prime is 20291138449. The next prime is 20291138501. The reversal of 20291138452 is 25483119202.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1810827 + ... + 1821997.

It is an arithmetic number, because the mean of its divisors is an integer number (1068579456).

Almost surely, 2^20291138452 is an apocalyptic number.

It is an amenable number.

20291138452 is a deficient number, since it is larger than the sum of its proper divisors (18177721964).

20291138452 is a wasteful number, since it uses less digits than its factorization.

20291138452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13888 (or 13873 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 20291138452 in words is "twenty billion, two hundred ninety-one million, one hundred thirty-eight thousand, four hundred fifty-two".