20402254012 has 24 divisors (see below), whose sum is σ = 40812944256. Its totient is φ = 8742015408.

The previous prime is 20402254009. The next prime is 20402254043. The reversal of 20402254012 is 21045220402.

It is a super-2 number, since 2×20402254012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67263 + ... + 212905.

It is an arithmetic number, because the mean of its divisors is an integer number (1700539344).

Almost surely, 2^20402254012 is an apocalyptic number.

It is an amenable number.

20402254012 is an abundant number, since it is smaller than the sum of its proper divisors (20410690244).

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

20402254012 is a wasteful number, since it uses less digits than its factorization.

20402254012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150657 (or 150655 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 20402254012 its reverse (21045220402), we get a palindrome (41447474414).

The spelling of 20402254012 in words is "twenty billion, four hundred two million, two hundred fifty-four thousand, twelve".