20521537662 has 16 divisors (see below), whose sum is σ = 41044528512. Its totient is φ = 6840270360.

The previous prime is 20521537657. The next prime is 20521537691. The reversal of 20521537662 is 26673512502.

It is a happy number.

It is a super-2 number, since 2×20521537662² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20521537662.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231087 + ... + 307317.

It is an arithmetic number, because the mean of its divisors is an integer number (2565283032).

Almost surely, 2^20521537662 is an apocalyptic number.

20521537662 is an abundant number, since it is smaller than the sum of its proper divisors (20522990850).

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

20521537662 is a wasteful number, since it uses less digits than its factorization.

20521537662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121103.

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 20521537662 in words is "twenty billion, five hundred twenty-one million, five hundred thirty-seven thousand, six hundred sixty-two".