20613930 has 16 divisors (see below), whose sum is σ = 49473504. Its totient is φ = 5497040.

The previous prime is 20613907. The next prime is 20613941. The reversal of 20613930 is 3931602.

It is a super-2 number, since 2×20613930² = 849868220089800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20613930.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343536 + ... + 343595.

It is an arithmetic number, because the mean of its divisors is an integer number (3092094).

Almost surely, 2^20613930 is an apocalyptic number.

20613930 is an abundant number, since it is smaller than the sum of its proper divisors (28859574).

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

20613930 is a wasteful number, since it uses less digits than its factorization.

20613930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687141.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 20613930 is about 4540.2566006780. The cubic root of 20613930 is about 274.1912547533.

The spelling of 20613930 in words is "twenty million, six hundred thirteen thousand, nine hundred thirty".