20771523450 has 72 divisors (see below), whose sum is σ = 55840668156. Its totient is φ = 5535648000.

The previous prime is 20771523439. The next prime is 20771523497. The reversal of 20771523450 is 5432517702.

20771523450 is a `hidden beast` number, since 20 + 7 + 71 + 523 + 45 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 14255643609 + 6515879841 = 119397^2 + 80721^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 761040 + ... + 787860.

Almost surely, 2^20771523450 is an apocalyptic number.

20771523450 is an abundant number, since it is smaller than the sum of its proper divisors (35069144706).

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

20771523450 is a wasteful number, since it uses less digits than its factorization.

20771523450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28560 (or 28552 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The spelling of 20771523450 in words is "twenty billion, seven hundred seventy-one million, five hundred twenty-three thousand, four hundred fifty".