20621620877 has 16 divisors (see below), whose sum is σ = 24742271232. Its totient is φ = 16936662720.

The previous prime is 20621620847. The next prime is 20621620907. The reversal of 20621620877 is 77802612602.

It is an interprime number because it is at equal distance from previous prime (20621620847) and next prime (20621620907).

It is a cyclic number.

It is not a de Polignac number, because 20621620877 - 2¹⁰ = 20621619853 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 (20621620847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1527398 + ... + 1540839.

It is an arithmetic number, because the mean of its divisors is an integer number (1546391952).

Almost surely, 2^20621620877 is an apocalyptic number.

It is an amenable number.

20621620877 is a deficient number, since it is larger than the sum of its proper divisors (4120650355).

20621620877 is a wasteful number, since it uses less digits than its factorization.

20621620877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068308.

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 20621620877 in words is "twenty billion, six hundred twenty-one million, six hundred twenty thousand, eight hundred seventy-seven".