20946390534 has 128 divisors (see below), whose sum is σ = 48562053120. Its totient is φ = 6770952000.

The previous prime is 20946390503. The next prime is 20946390547. The reversal of 20946390534 is 43509364902.

20946390534 is a `hidden beast` number, since 2 + 0 + 9 + 4 + 639 + 0 + 5 + 3 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20946390534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48599299 + ... + 48599729.

It is an arithmetic number, because the mean of its divisors is an integer number (379391040).

Almost surely, 2^20946390534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20946390534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24281026560).

20946390534 is an abundant number, since it is smaller than the sum of its proper divisors (27615662586).

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

20946390534 is an equidigital number, since it uses as much as digits as its factorization.

20946390534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 20946390534 in words is "twenty billion, nine hundred forty-six million, three hundred ninety thousand, five hundred thirty-four".