20510025456 has 80 divisors (see below), whose sum is σ = 55898208000. Its totient is φ = 6462296064.

The previous prime is 20510025449. The next prime is 20510025463. The reversal of 20510025456 is 65452001502.

It is an interprime number because it is at equal distance from previous prime (20510025449) and next prime (20510025463).

It is a super-2 number, since 2×20510025456² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384445 + ... + 434531.

It is an arithmetic number, because the mean of its divisors is an integer number (698727600).

Almost surely, 2^20510025456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20510025456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27949104000).

20510025456 is an abundant number, since it is smaller than the sum of its proper divisors (35388182544).

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

20510025456 is a wasteful number, since it uses less digits than its factorization.

20510025456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50566 (or 50560 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 20510025456 its reverse (65452001502), we get a palindrome (85962026958).

The spelling of 20510025456 in words is "twenty billion, five hundred ten million, twenty-five thousand, four hundred fifty-six".