20621104065 has 32 divisors (see below), whose sum is σ = 37439746560. Its totient is φ = 10763920512.

The previous prime is 20621104051. The next prime is 20621104079. The reversal of 20621104065 is 56040112602.

20621104065 is a `hidden beast` number, since 20 + 621 + 10 + 4 + 0 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (20621104051) and next prime (20621104079).

It is not a de Polignac number, because 20621104065 - 2⁵ = 20621104033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1618644 + ... + 1631333.

It is an arithmetic number, because the mean of its divisors is an integer number (1169992080).

Almost surely, 2^20621104065 is an apocalyptic number.

It is an amenable number.

20621104065 is a deficient number, since it is larger than the sum of its proper divisors (16818642495).

20621104065 is a wasteful number, since it uses less digits than its factorization.

20621104065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250038 (or 3250032 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 20621104065 its reverse (56040112602), we get a palindrome (76661216667).

The spelling of 20621104065 in words is "twenty billion, six hundred twenty-one million, one hundred four thousand, sixty-five".