20425755144 has 16 divisors (see below), whose sum is σ = 51064387920. Its totient is φ = 6808585040.

The previous prime is 20425755143. The next prime is 20425755151. The reversal of 20425755144 is 44155752402.

It is a super-2 number, since 2×20425755144² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20425755143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 425536542 + ... + 425536589.

It is an arithmetic number, because the mean of its divisors is an integer number (3191524245).

Almost surely, 2^20425755144 is an apocalyptic number.

20425755144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20425755144 is an abundant number, since it is smaller than the sum of its proper divisors (30638632776).

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

20425755144 is a wasteful number, since it uses less digits than its factorization.

20425755144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851073140 (or 851073136 counting only the distinct ones).

The product of its (nonzero) digits is 224000, while the sum is 39.

The spelling of 20425755144 in words is "twenty billion, four hundred twenty-five million, seven hundred fifty-five thousand, one hundred forty-four".