20812904386 has 4 divisors (see below), whose sum is σ = 31219356582. Its totient is φ = 10406452192.

The previous prime is 20812904383. The next prime is 20812904389. The reversal of 20812904386 is 68340921802.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20812904383) and next prime (20812904389).

It can be written as a sum of positive squares in only one way, i.e., 10612914361 + 10199990025 = 103019^2 + 100995^2 .

It is not an unprimeable number, because it can be changed into a prime (20812904383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5203226095 + ... + 5203226098.

Almost surely, 2^20812904386 is an apocalyptic number.

20812904386 is a deficient number, since it is larger than the sum of its proper divisors (10406452196).

20812904386 is a wasteful number, since it uses less digits than its factorization.

20812904386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10406452195.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 20812904386 in words is "twenty billion, eight hundred twelve million, nine hundred four thousand, three hundred eighty-six".