20081217457 has 32 divisors (see below), whose sum is σ = 23541331968. Its totient is φ = 16776082176.

The previous prime is 20081217427. The next prime is 20081217461. The reversal of 20081217457 is 75471218002.

It is not a de Polignac number, because 20081217457 - 2³¹ = 17933733809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20081217427) 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, 17266158 + ... + 17267320.

It is an arithmetic number, because the mean of its divisors is an integer number (735666624).

Almost surely, 2^20081217457 is an apocalyptic number.

It is an amenable number.

20081217457 is a deficient number, since it is larger than the sum of its proper divisors (3460114511).

20081217457 is a wasteful number, since it uses less digits than its factorization.

20081217457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629.

The product of its (nonzero) digits is 31360, while the sum is 37.

The spelling of 20081217457 in words is "twenty billion, eighty-one million, two hundred seventeen thousand, four hundred fifty-seven".