20423212002 has 72 divisors (see below), whose sum is σ = 45468446868. Its totient is φ = 6625232640.

The previous prime is 20423211989. The next prime is 20423212027. The reversal of 20423212002 is 20021232402.

20423212002 is a `hidden beast` number, since 20 + 423 + 21 + 200 + 2 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 10041843681 + 10381368321 = 100209^2 + 101889^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20484168 + ... + 20485164.

Almost surely, 2^20423212002 is an apocalyptic number.

20423212002 is an abundant number, since it is smaller than the sum of its proper divisors (25045234866).

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

20423212002 is a wasteful number, since it uses less digits than its factorization.

20423212002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764 (or 1720 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20423212002 its reverse (20021232402), we get a palindrome (40444444404).

The spelling of 20423212002 in words is "twenty billion, four hundred twenty-three million, two hundred twelve thousand, two".