20651402831 has 16 divisors (see below), whose sum is σ = 21828204000. Its totient is φ = 19509587328.

The previous prime is 20651402819. The next prime is 20651402839. The reversal of 20651402831 is 13820415602.

It is a cyclic number.

It is not a de Polignac number, because 20651402831 - 2⁶ = 20651402767 is a prime.

It is a super-2 number, since 2×20651402831² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651402839) 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, 253841 + ... + 325173.

It is an arithmetic number, because the mean of its divisors is an integer number (1364262750).

Almost surely, 2^20651402831 is an apocalyptic number.

20651402831 is a deficient number, since it is larger than the sum of its proper divisors (1176801169).

20651402831 is a wasteful number, since it uses less digits than its factorization.

20651402831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71578.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 20651402831 in words is "twenty billion, six hundred fifty-one million, four hundred two thousand, eight hundred thirty-one".