20949030564 has 216 divisors, whose sum is σ = 65794589280. Its totient is φ = 5154589440.

The previous prime is 20949030559. The next prime is 20949030577. The reversal of 20949030564 is 46503094902.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1344064 + ... + 1359560.

It is an arithmetic number, because the mean of its divisors is an integer number (304604580).

Almost surely, 2^20949030564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20949030564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32897294640).

20949030564 is an abundant number, since it is smaller than the sum of its proper divisors (44845558716).

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

20949030564 is a wasteful number, since it uses less digits than its factorization.

20949030564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15559 (or 15539 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 20949030564 in words is "twenty billion, nine hundred forty-nine million, thirty thousand, five hundred sixty-four".