20505630212 has 24 divisors (see below), whose sum is σ = 36479658936. Its totient is φ = 10083667968.

The previous prime is 20505630209. The next prime is 20505630241. The reversal of 20505630212 is 21203650502.

It can be written as a sum of positive squares in 4 ways, for example, as 2211444676 + 18294185536 = 47026^2 + 135256^2 .

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, 3608 + ... + 202544.

It is an arithmetic number, because the mean of its divisors is an integer number (1519985789).

Almost surely, 2^20505630212 is an apocalyptic number.

It is an amenable number.

20505630212 is a deficient number, since it is larger than the sum of its proper divisors (15974028724).

20505630212 is a wasteful number, since it uses less digits than its factorization.

20505630212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199367 (or 199365 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 20505630212 in words is "twenty billion, five hundred five million, six hundred thirty thousand, two hundred twelve".