20631430260 has 144 divisors (see below), whose sum is σ = 71778051072. Its totient is φ = 4698892800.

The previous prime is 20631430249. The next prime is 20631430291. The reversal of 20631430260 is 6203413602.

20631430260 is a `hidden beast` number, since 2 + 0 + 631 + 4 + 3 + 0 + 26 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 324925 + ... + 383195.

It is an arithmetic number, because the mean of its divisors is an integer number (498458688).

Almost surely, 2^20631430260 is an apocalyptic number.

20631430260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20631430260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35889025536).

20631430260 is an abundant number, since it is smaller than the sum of its proper divisors (51146620812).

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

20631430260 is a wasteful number, since it uses less digits than its factorization.

20631430260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58574 (or 58569 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 20631430260 its reverse (6203413602), we get a palindrome (26834843862).

The spelling of 20631430260 in words is "twenty billion, six hundred thirty-one million, four hundred thirty thousand, two hundred sixty".