20438133444 has 27 divisors (see below), whose sum is σ = 51665227887. Its totient is φ = 6812425224.

The previous prime is 20438133433. The next prime is 20438133449. The reversal of 20438133444 is 44433183402.

The square root of 20438133444 is 142962.

It is a perfect power (a square), and thus also a powerful number.

20438133444 is a `hidden beast` number, since 204 + 3 + 8 + 1 + 3 + 3 + 444 = 666.

It is a super-2 number, since 2×20438133444² (a number of 21 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 20438133399 and 20438133408.

It is not an unprimeable number, because it can be changed into a prime (20438133449) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 845859 + ... + 869685.

Almost surely, 2^20438133444 is an apocalyptic number.

20438133444 is the 142962-nd square number.

It is an amenable number.

20438133444 is an abundant number, since it is smaller than the sum of its proper divisors (31227094443).

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

20438133444 is an frugal number, since it uses more digits than its factorization.

20438133444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47664 (or 23832 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

Multiplying 20438133444 by its sum of digits (36), we get a square (735772803984 = 857772²).

20438133444 divided by its sum of digits (36) gives a square (567725929 = 23827²).

The spelling of 20438133444 in words is "twenty billion, four hundred thirty-eight million, one hundred thirty-three thousand, four hundred forty-four".