20644426224 has 30 divisors (see below), whose sum is σ = 57775721016. Its totient is φ = 6881475360.

The previous prime is 20644426219. The next prime is 20644426247. The reversal of 20644426224 is 42262444602.

20644426224 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 4 + 426 + 224 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71681892 + ... + 71682179.

Almost surely, 2^20644426224 is an apocalyptic number.

20644426224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20644426224 is an abundant number, since it is smaller than the sum of its proper divisors (37131294792).

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

20644426224 is a wasteful number, since it uses less digits than its factorization.

20644426224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143364085 (or 143364076 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 36.

The spelling of 20644426224 in words is "twenty billion, six hundred forty-four million, four hundred twenty-six thousand, two hundred twenty-four".