20812967390 has 32 divisors (see below), whose sum is σ = 37756243584. Its totient is φ = 8260161280.

The previous prime is 20812967389. The next prime is 20812967393. The reversal of 20812967390 is 9376921802.

It is a happy number.

It is a super-2 number, since 2×20812967390² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20812967393) 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 15 ways as a sum of consecutive naturals, for example, 4870955 + ... + 4875225.

It is an arithmetic number, because the mean of its divisors is an integer number (1179882612).

Almost surely, 2^20812967390 is an apocalyptic number.

20812967390 is a deficient number, since it is larger than the sum of its proper divisors (16943276194).

20812967390 is a wasteful number, since it uses less digits than its factorization.

20812967390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7972.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 20812967390 in words is "twenty billion, eight hundred twelve million, nine hundred sixty-seven thousand, three hundred ninety".