20437405729 has 32 divisors (see below), whose sum is σ = 24069467520. Its totient is φ = 17177951232.

The previous prime is 20437405717. The next prime is 20437405739. The reversal of 20437405729 is 92750473402.

It is not a de Polignac number, because 20437405729 - 2⁵ = 20437405697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20437405739) 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, 1456702 + ... + 1470664.

It is an arithmetic number, because the mean of its divisors is an integer number (752170860).

Almost surely, 2^20437405729 is an apocalyptic number.

It is an amenable number.

20437405729 is a deficient number, since it is larger than the sum of its proper divisors (3632061791).

20437405729 is a wasteful number, since it uses less digits than its factorization.

20437405729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14209.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 20437405729 in words is "twenty billion, four hundred thirty-seven million, four hundred five thousand, seven hundred twenty-nine".