7020820909 has 16 divisors (see below), whose sum is σ = 7469763840. Its totient is φ = 6585131520.

The previous prime is 7020820903. The next prime is 7020820913. The reversal of 7020820909 is 9090280207.

It is a cyclic number.

It is not a de Polignac number, because 7020820909 - 2³ = 7020820901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7020820901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228744 + ... + 257614.

It is an arithmetic number, because the mean of its divisors is an integer number (466860240).

Almost surely, 2^7020820909 is an apocalyptic number.

It is an amenable number.

7020820909 is a deficient number, since it is larger than the sum of its proper divisors (448942931).

7020820909 is a wasteful number, since it uses less digits than its factorization.

7020820909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29100.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 7020820909 is about 83790.3389956145. The cubic root of 7020820909 is about 1914.8259228631.

The spelling of 7020820909 in words is "seven billion, twenty million, eight hundred twenty thousand, nine hundred nine".