20581050537 has 16 divisors (see below), whose sum is σ = 30621314880. Its totient is φ = 13661809056.

The previous prime is 20581050487. The next prime is 20581050541. The reversal of 20581050537 is 73505018502.

20581050537 is a `hidden beast` number, since 20 + 58 + 1 + 0 + 50 + 537 = 666.

It is not a de Polignac number, because 20581050537 - 2⁶ = 20581050473 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20581050547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1629463 + ... + 1642044.

It is an arithmetic number, because the mean of its divisors is an integer number (1913832180).

Almost surely, 2^20581050537 is an apocalyptic number.

20581050537 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20581050537 is a deficient number, since it is larger than the sum of its proper divisors (10040264343).

20581050537 is a wasteful number, since it uses less digits than its factorization.

20581050537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271749 (or 3271743 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 20581050537 in words is "twenty billion, five hundred eighty-one million, fifty thousand, five hundred thirty-seven".