52020309 has 32 divisors (see below), whose sum is σ = 80294400. Its totient is φ = 29626560.

The previous prime is 52020307. The next prime is 52020317. The reversal of 52020309 is 90302025.

It is not a de Polignac number, because 52020309 - 2¹ = 52020307 is a prime.

It is a super-2 number, since 2×52020309² = 5412225096910962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52020307) 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, 101947 + ... + 102455.

It is an arithmetic number, because the mean of its divisors is an integer number (2509200).

Almost surely, 2^52020309 is an apocalyptic number.

It is an amenable number.

52020309 is a deficient number, since it is larger than the sum of its proper divisors (28274091).

52020309 is a wasteful number, since it uses less digits than its factorization.

52020309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 52020309 is about 7212.5105892470. The cubic root of 52020309 is about 373.2997013886.

The spelling of 52020309 in words is "fifty-two million, twenty thousand, three hundred nine".