20630505402 has 144 divisors (see below), whose sum is σ = 50524131840. Its totient is φ = 6046814592.

The previous prime is 20630505353. The next prime is 20630505403. The reversal of 20630505402 is 20450503602.

20630505402 is a `hidden beast` number, since 20 + 630 + 5 + 0 + 5 + 4 + 0 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (20630505403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 15546063 + ... + 15547389.

Almost surely, 2^20630505402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20630505402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25262065920).

20630505402 is an abundant number, since it is smaller than the sum of its proper divisors (29893626438).

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

20630505402 is a wasteful number, since it uses less digits than its factorization.

20630505402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485 (or 1453 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 20630505402 in words is "twenty billion, six hundred thirty million, five hundred five thousand, four hundred two".