630020831 has 4 divisors (see below), whose sum is σ = 687295464. Its totient is φ = 572746200.

The previous prime is 630020707. The next prime is 630020837. The reversal of 630020831 is 138020036.

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 630020831 - 2¹⁰ = 630019807 is a prime.

It is a super-2 number, since 2×630020831² = 793852494987861122, 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 = 630020797 and 630020806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630020837) 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, 28637300 + ... + 28637321.

It is an arithmetic number, because the mean of its divisors is an integer number (171823866).

Almost surely, 2^630020831 is an apocalyptic number.

630020831 is a deficient number, since it is larger than the sum of its proper divisors (57274633).

630020831 is a wasteful number, since it uses less digits than its factorization.

630020831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57274632.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 630020831 is about 25100.2157560448. The cubic root of 630020831 is about 857.2713366047.

Adding to 630020831 its reverse (138020036), we get a palindrome (768040867).

The spelling of 630020831 in words is "six hundred thirty million, twenty thousand, eight hundred thirty-one".