20549772 has 18 divisors (see below), whose sum is σ = 51945348. Its totient is φ = 6849912.

The previous prime is 20549761. The next prime is 20549783. The reversal of 20549772 is 27794502.

It is an interprime number because it is at equal distance from previous prime (20549761) and next prime (20549783).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 570827 = 20549772 / (2 + 0 + 5 + 4 + 9 + 7 + 7 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 285378 + ... + 285449.

Almost surely, 2^20549772 is an apocalyptic number.

It is an amenable number.

20549772 is an abundant number, since it is smaller than the sum of its proper divisors (31395576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20549772 is a wasteful number, since it uses less digits than its factorization.

20549772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570837 (or 570832 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20549772 is about 4533.1856348489. The cubic root of 20549772 is about 273.9064983680.

It can be divided in two parts, 20549 and 772, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20549772 in words is "twenty million, five hundred forty-nine thousand, seven hundred seventy-two".