20471253242 has 16 divisors (see below), whose sum is σ = 33514571232. Its totient is φ = 9300627120.

The previous prime is 20471253241. The next prime is 20471253259. The reversal of 20471253242 is 24235217402.

It is a junction number, because it is equal to n+sod(n) for n = 20471253199 and 20471253208.

It is not an unprimeable number, because it can be changed into a prime (20471253241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177533 + ... + 269184.

It is an arithmetic number, because the mean of its divisors is an integer number (2094660702).

Almost surely, 2^20471253242 is an apocalyptic number.

20471253242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20471253242 is a deficient number, since it is larger than the sum of its proper divisors (13043317990).

20471253242 is a wasteful number, since it uses less digits than its factorization.

20471253242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448813.

The product of its (nonzero) digits is 26880, while the sum is 32.

The spelling of 20471253242 in words is "twenty billion, four hundred seventy-one million, two hundred fifty-three thousand, two hundred forty-two".