20402223444 has 36 divisors (see below), whose sum is σ = 51606828000. Its totient is φ = 6796186320.

The previous prime is 20402223437. The next prime is 20402223473. The reversal of 20402223444 is 44432220402.

20402223444 is a `hidden beast` number, since 20 + 402 + 2 + 234 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20402223444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135072 + ... + 242999.

It is an arithmetic number, because the mean of its divisors is an integer number (1433523000).

Almost surely, 2^20402223444 is an apocalyptic number.

It is an amenable number.

20402223444 is an abundant number, since it is smaller than the sum of its proper divisors (31204604556).

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

20402223444 is a wasteful number, since it uses less digits than its factorization.

20402223444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379580 (or 379575 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 27.

Adding to 20402223444 its reverse (44432220402), we get a palindrome (64834443846).

The spelling of 20402223444 in words is "twenty billion, four hundred two million, two hundred twenty-three thousand, four hundred forty-four".