20961827524 has 27 divisors (see below), whose sum is σ = 40327329133. Its totient is φ = 9526655600.

The previous prime is 20961827503. The next prime is 20961827569. The reversal of 20961827524 is 42572816902.

The square root of 20961827524 is 144782.

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

It can be written as a sum of positive squares in only one way, i.e., 5015189124 + 15946638400 = 70818^2 + 126280^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3181914 + ... + 3188494.

Almost surely, 2^20961827524 is an apocalyptic number.

20961827524 is the 144782-nd square number.

It is an amenable number.

20961827524 is a deficient number, since it is larger than the sum of its proper divisors (19365501609).

20961827524 is an frugal number, since it uses more digits than its factorization.

20961827524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13188 (or 6594 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 20961827524 in words is "twenty billion, nine hundred sixty-one million, eight hundred twenty-seven thousand, five hundred twenty-four".