20299391 has 24 divisors (see below), whose sum is σ = 25420320. Its totient is φ = 15857856.

The previous prime is 20299381. The next prime is 20299399. The reversal of 20299391 is 19399202.

20299391 = 38³ + 39³ + ... + 95³.

It is not a de Polignac number, because 20299391 - 2¹⁰ = 20298367 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 (20299399) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73145 + ... + 73421.

It is an arithmetic number, because the mean of its divisors is an integer number (1059180).

Almost surely, 2^20299391 is an apocalyptic number.

20299391 is a deficient number, since it is larger than the sum of its proper divisors (5120929).

20299391 is a wasteful number, since it uses less digits than its factorization.

20299391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 20299391 is about 4505.4845466387. The cubic root of 20299391 is about 272.7895124651.

The spelling of 20299391 in words is "twenty million, two hundred ninety-nine thousand, three hundred ninety-one".