20945830 has 16 divisors (see below), whose sum is σ = 39003120. Its totient is φ = 8089312.

The previous prime is 20945807. The next prime is 20945833. The reversal of 20945830 is 3854902.

It is a junction number, because it is equal to n+sod(n) for n = 20945792 and 20945801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20945833) 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, 35824 + ... + 36403.

It is an arithmetic number, because the mean of its divisors is an integer number (2437695).

Almost surely, 2^20945830 is an apocalyptic number.

20945830 is a deficient number, since it is larger than the sum of its proper divisors (18057290).

20945830 is a wasteful number, since it uses less digits than its factorization.

20945830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72263.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20945830 is about 4576.6614469502. The cubic root of 20945830 is about 275.6549896839.

The spelling of 20945830 in words is "twenty million, nine hundred forty-five thousand, eight hundred thirty".