216020739 has 32 divisors (see below), whose sum is σ = 331257600. Its totient is φ = 123992960.

The previous prime is 216020737. The next prime is 216020743. The reversal of 216020739 is 937020612.

It is a cyclic number.

It is not a de Polignac number, because 216020739 - 2¹ = 216020737 is a prime.

It is a super-2 number, since 2×216020739² = 93329919356212242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216020731) 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, 48592 + ... + 52850.

It is an arithmetic number, because the mean of its divisors is an integer number (10351800).

Almost surely, 2^216020739 is an apocalyptic number.

216020739 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

216020739 is a deficient number, since it is larger than the sum of its proper divisors (115236861).

216020739 is a wasteful number, since it uses less digits than its factorization.

216020739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4355.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 216020739 is about 14697.6439948721. The cubic root of 216020739 is about 600.0192021632.

The spelling of 216020739 in words is "two hundred sixteen million, twenty thousand, seven hundred thirty-nine".