20402721559 has 16 divisors (see below), whose sum is σ = 22870130976. Its totient is φ = 18037900800.

The previous prime is 20402721557. The next prime is 20402721613. The reversal of 20402721559 is 95512720402.

It is a cyclic number.

It is not a de Polignac number, because 20402721559 - 2¹ = 20402721557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402721553) 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, 917379 + ... + 939355.

It is an arithmetic number, because the mean of its divisors is an integer number (1429383186).

Almost surely, 2^20402721559 is an apocalyptic number.

20402721559 is a deficient number, since it is larger than the sum of its proper divisors (2467409417).

20402721559 is a wasteful number, since it uses less digits than its factorization.

20402721559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24306.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 20402721559 in words is "twenty billion, four hundred two million, seven hundred twenty-one thousand, five hundred fifty-nine".