20435401569 has 32 divisors (see below), whose sum is σ = 31400271360. Its totient is φ = 11691388800.

The previous prime is 20435401561. The next prime is 20435401573. The reversal of 20435401569 is 96510453402.

It is not a de Polignac number, because 20435401569 - 2³ = 20435401561 is a prime.

It is a super-2 number, since 2×20435401569² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20435401561) 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, 118194 + ... + 234180.

It is an arithmetic number, because the mean of its divisors is an integer number (981258480).

Almost surely, 2^20435401569 is an apocalyptic number.

It is an amenable number.

20435401569 is a deficient number, since it is larger than the sum of its proper divisors (10964869791).

20435401569 is a wasteful number, since it uses less digits than its factorization.

20435401569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116301.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 20435401569 in words is "twenty billion, four hundred thirty-five million, four hundred one thousand, five hundred sixty-nine".