20153222644 has 24 divisors (see below), whose sum is σ = 35479231200. Its totient is φ = 10016344800.

The previous prime is 20153222629. The next prime is 20153222653. The reversal of 20153222644 is 44622235102.

It is a congruent number.

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, 2753662 + ... + 2760970.

It is an arithmetic number, because the mean of its divisors is an integer number (1478301300).

Almost surely, 2^20153222644 is an apocalyptic number.

It is an amenable number.

20153222644 is a deficient number, since it is larger than the sum of its proper divisors (15326008556).

20153222644 is a wasteful number, since it uses less digits than its factorization.

20153222644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11343 (or 11341 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 20153222644 its reverse (44622235102), we get a palindrome (64775457746).

The spelling of 20153222644 in words is "twenty billion, one hundred fifty-three million, two hundred twenty-two thousand, six hundred forty-four".