20802460251 has 32 divisors (see below), whose sum is σ = 29377704960. Its totient is φ = 13057099776.

The previous prime is 20802460243. The next prime is 20802460267. The reversal of 20802460251 is 15206420802.

It is not a de Polignac number, because 20802460251 - 2³ = 20802460243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20802460271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6629755 + ... + 6632891.

It is an arithmetic number, because the mean of its divisors is an integer number (918053280).

Almost surely, 2^20802460251 is an apocalyptic number.

20802460251 is a deficient number, since it is larger than the sum of its proper divisors (8575244709).

20802460251 is a wasteful number, since it uses less digits than its factorization.

20802460251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3843.

The product of its (nonzero) digits is 7680, while the sum is 30.

The spelling of 20802460251 in words is "twenty billion, eight hundred two million, four hundred sixty thousand, two hundred fifty-one".