20463660021 has 32 divisors (see below), whose sum is σ = 32350752000. Its totient is φ = 11257827840.

The previous prime is 20463659989. The next prime is 20463660023. The reversal of 20463660021 is 12006636402.

It is not a de Polignac number, because 20463660021 - 2⁵ = 20463659989 is a prime.

It is a super-2 number, since 2×20463660021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20463660023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164401 + ... + 260681.

It is an arithmetic number, because the mean of its divisors is an integer number (1010961000).

Almost surely, 2^20463660021 is an apocalyptic number.

20463660021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20463660021 is a deficient number, since it is larger than the sum of its proper divisors (11887091979).

20463660021 is a wasteful number, since it uses less digits than its factorization.

20463660021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96669.

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 20463660021 in words is "twenty billion, four hundred sixty-three million, six hundred sixty thousand, twenty-one".