20425500400440 has 32 divisors (see below), whose sum is σ = 61276501201680. Its totient is φ = 5446800106752.

The previous prime is 20425500400433. The next prime is 20425500400447. The reversal of 20425500400440 is 4400400552402.

It is an interprime number because it is at equal distance from previous prime (20425500400433) and next prime (20425500400447).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20425500400398 and 20425500400407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425500400447) 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, 85106251549 + ... + 85106251788.

Almost surely, 2^{20425500400440} is an apocalyptic number.

20425500400440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20425500400440 is an abundant number, since it is smaller than the sum of its proper divisors (40851000801240).

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

20425500400440 is a wasteful number, since it uses less digits than its factorization.

20425500400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170212503351 (or 170212503347 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 30.

Adding to 20425500400440 its reverse (4400400552402), we get a palindrome (24825900952842).

The spelling of 20425500400440 in words is "twenty trillion, four hundred twenty-five billion, five hundred million, four hundred thousand, four hundred forty".