20425645040 has 40 divisors (see below), whose sum is σ = 48268154688. Its totient is φ = 8036317440.

The previous prime is 20425645021. The next prime is 20425645049. The reversal of 20425645040 is 4054652402.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 20425644988 and 20425645006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425645049) 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, 2087912 + ... + 2097671.

Almost surely, 2^20425645040 is an apocalyptic number.

20425645040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20425645040 is an abundant number, since it is smaller than the sum of its proper divisors (27842509648).

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

20425645040 is a wasteful number, since it uses less digits than its factorization.

20425645040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4185657 (or 4185651 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

The spelling of 20425645040 in words is "twenty billion, four hundred twenty-five million, six hundred forty-five thousand, forty".