20941969446 has 72 divisors (see below), whose sum is σ = 47662694040. Its totient is φ = 6815826072.

The previous prime is 20941969441. The next prime is 20941969511. The reversal of 20941969446 is 64496914902.

It is a happy number.

20941969446 is a `hidden beast` number, since 2 + 0 + 9 + 4 + 196 + 9 + 446 = 666.

It is a super-4 number, since 4×20941969446⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 20941969392 and 20941969401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20941969441) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 49980625 + ... + 49981043.

Almost surely, 2^20941969446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20941969446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23831347020).

20941969446 is an abundant number, since it is smaller than the sum of its proper divisors (26720724594).

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

20941969446 is an frugal number, since it uses more digits than its factorization.

20941969446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

Multiplying 20941969446 by its sum of digits (54), we get a square (1130866350084 = 1063422²).

20941969446 divided by its sum of digits (54) gives a square (387814249 = 19693²).

The spelling of 20941969446 in words is "twenty billion, nine hundred forty-one million, nine hundred sixty-nine thousand, four hundred forty-six".