920400620639 has 4 divisors (see below), whose sum is σ = 920542423560. Its totient is φ = 920258817720.

The previous prime is 920400620627. The next prime is 920400620641. The reversal of 920400620639 is 936026004029.

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

It is a cyclic number.

It is not a de Polignac number, because 920400620639 - 2²⁰ = 920399572063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 920400620596 and 920400620605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (920400620339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70891724 + ... + 70904705.

It is an arithmetic number, because the mean of its divisors is an integer number (230135605890).

Almost surely, 2^920400620639 is an apocalyptic number.

920400620639 is a deficient number, since it is larger than the sum of its proper divisors (141802921).

920400620639 is a wasteful number, since it uses less digits than its factorization.

920400620639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141802920.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 920400620639 in words is "nine hundred twenty billion, four hundred million, six hundred twenty thousand, six hundred thirty-nine".