20435020657 has 16 divisors (see below), whose sum is σ = 22453724160. Its totient is φ = 18511230672.

The previous prime is 20435020633. The next prime is 20435020673. The reversal of 20435020657 is 75602053402.

It is a cyclic number.

It is not a de Polignac number, because 20435020657 - 2²³ = 20426632049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20435020687) 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, 1576798 + ... + 1589704.

It is an arithmetic number, because the mean of its divisors is an integer number (1403357760).

Almost surely, 2^20435020657 is an apocalyptic number.

It is an amenable number.

20435020657 is a deficient number, since it is larger than the sum of its proper divisors (2018703503).

20435020657 is a wasteful number, since it uses less digits than its factorization.

20435020657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16572.

The product of its (nonzero) digits is 50400, while the sum is 34.

The spelling of 20435020657 in words is "twenty billion, four hundred thirty-five million, twenty thousand, six hundred fifty-seven".