20434765 has 16 divisors (see below), whose sum is σ = 27962928. Its totient is φ = 14201856.

The previous prime is 20434759. The next prime is 20434789. The reversal of 20434765 is 56743402.

It can be written as a sum of positive squares in 8 ways, for example, as 561001 + 19873764 = 749^2 + 4458^2 .

It is a cyclic number.

It is not a de Polignac number, because 20434765 - 2¹³ = 20426573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8142 + ... + 10351.

It is an arithmetic number, because the mean of its divisors is an integer number (1747683).

Almost surely, 2^20434765 is an apocalyptic number.

It is an amenable number.

20434765 is a deficient number, since it is larger than the sum of its proper divisors (7528163).

20434765 is a wasteful number, since it uses less digits than its factorization.

20434765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18528.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 20434765 is about 4520.4828281944. The cubic root of 20434765 is about 273.3945687048.

It can be divided in two parts, 204 and 34765, that added together give a square (34969 = 187²).

The spelling of 20434765 in words is "twenty million, four hundred thirty-four thousand, seven hundred sixty-five".