20213830 has 64 divisors (see below), whose sum is σ = 45440640. Its totient is φ = 6303744.

The previous prime is 20213819. The next prime is 20213857. The reversal of 20213830 is 3831202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20213798 and 20213807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88156 + ... + 88384.

It is an arithmetic number, because the mean of its divisors is an integer number (710010).

Almost surely, 2^20213830 is an apocalyptic number.

20213830 is an abundant number, since it is smaller than the sum of its proper divisors (25226810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20213830 is a wasteful number, since it uses less digits than its factorization.

20213830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20213830 is about 4495.9793148990. The cubic root of 20213830 is about 272.4057076336.

The spelling of 20213830 in words is "twenty million, two hundred thirteen thousand, eight hundred thirty".