20621001567 has 4 divisors (see below), whose sum is σ = 27494668760. Its totient is φ = 13747334376.

The previous prime is 20621001503. The next prime is 20621001589. The reversal of 20621001567 is 76510012602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20621001567 - 2⁶ = 20621001503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20621001767) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3436833592 + ... + 3436833597.

It is an arithmetic number, because the mean of its divisors is an integer number (6873667190).

Almost surely, 2^20621001567 is an apocalyptic number.

20621001567 is a deficient number, since it is larger than the sum of its proper divisors (6873667193).

20621001567 is an equidigital number, since it uses as much as digits as its factorization.

20621001567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6873667192.

The product of its (nonzero) digits is 5040, while the sum is 30.

The spelling of 20621001567 in words is "twenty billion, six hundred twenty-one million, one thousand, five hundred sixty-seven".