20351764 has 12 divisors (see below), whose sum is σ = 35983444. Its totient is φ = 10070784.

The previous prime is 20351741. The next prime is 20351783. The reversal of 20351764 is 46715302.

It can be written as a sum of positive squares in 2 ways, for example, as 8655364 + 11696400 = 2942^2 + 3420^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25839 + ... + 26614.

Almost surely, 2^20351764 is an apocalyptic number.

It is an amenable number.

20351764 is a deficient number, since it is larger than the sum of its proper divisors (15631680).

20351764 is a wasteful number, since it uses less digits than its factorization.

20351764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52554 (or 52552 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20351764 is about 4511.2929410536. The cubic root of 20351764 is about 273.0239125337.

It can be divided in two parts, 20351 and 764, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20351764 in words is "twenty million, three hundred fifty-one thousand, seven hundred sixty-four".