20999030 has 16 divisors (see below), whose sum is σ = 40706064. Its totient is φ = 7753440.

The previous prime is 20999021. The next prime is 20999039. The reversal of 20999030 is 3099902.

It is an interprime number because it is at equal distance from previous prime (20999021) and next prime (20999039).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20999039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80636 + ... + 80895.

It is an arithmetic number, because the mean of its divisors is an integer number (2544129).

Almost surely, 2^20999030 is an apocalyptic number.

20999030 is a deficient number, since it is larger than the sum of its proper divisors (19707034).

20999030 is a wasteful number, since it uses less digits than its factorization.

20999030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161551.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 20999030 is about 4582.4698580569. The cubic root of 20999030 is about 275.8881697053. Note that the first 3 decimals are identical.

The spelling of 20999030 in words is "twenty million, nine hundred ninety-nine thousand, thirty".