20630431020 has 24 divisors (see below), whose sum is σ = 57765207024. Its totient is φ = 5501448256.

The previous prime is 20630431009. The next prime is 20630431033. The reversal of 20630431020 is 2013403602.

It is a happy number.

It is a super-2 number, since 2×20630431020² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171920199 + ... + 171920318.

It is an arithmetic number, because the mean of its divisors is an integer number (2406883626).

Almost surely, 2^20630431020 is an apocalyptic number.

20630431020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20630431020 is an abundant number, since it is smaller than the sum of its proper divisors (37134776004).

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

20630431020 is a wasteful number, since it uses less digits than its factorization.

20630431020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343840529 (or 343840527 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20630431020 its reverse (2013403602), we get a palindrome (22643834622).

The spelling of 20630431020 in words is "twenty billion, six hundred thirty million, four hundred thirty-one thousand, twenty".