620445631 has 16 divisors (see below), whose sum is σ = 701717184. Its totient is φ = 544287744.

The previous prime is 620445629. The next prime is 620445647. The reversal of 620445631 is 136544026.

It is not a de Polignac number, because 620445631 - 2¹ = 620445629 is a prime.

It is a super-2 number, since 2×620445631² = 769905562053976322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 620445593 and 620445602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620445431) 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, 40335 + ... + 53551.

It is an arithmetic number, because the mean of its divisors is an integer number (43857324).

Almost surely, 2^620445631 is an apocalyptic number.

620445631 is a deficient number, since it is larger than the sum of its proper divisors (81271553).

620445631 is a wasteful number, since it uses less digits than its factorization.

620445631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13410.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 620445631 is about 24908.7460744213. The cubic root of 620445631 is about 852.9061453149.

Adding to 620445631 its reverse (136544026), we get a palindrome (756989657).

The spelling of 620445631 in words is "six hundred twenty million, four hundred forty-five thousand, six hundred thirty-one".