20424615620621 has 32 divisors (see below), whose sum is σ = 21092879478528. Its totient is φ = 19769199690240.

The previous prime is 20424615620573. The next prime is 20424615620639. The reversal of 20424615620621 is 12602651642402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20424615620621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424615620821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4315361171 + ... + 4315365903.

It is an arithmetic number, because the mean of its divisors is an integer number (659152483704).

Almost surely, 2^{20424615620621} is an apocalyptic number.

It is an amenable number.

20424615620621 is a deficient number, since it is larger than the sum of its proper divisors (668263857907).

20424615620621 is a wasteful number, since it uses less digits than its factorization.

20424615620621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8021.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 20424615620621 in words is "twenty trillion, four hundred twenty-four billion, six hundred fifteen million, six hundred twenty thousand, six hundred twenty-one".