20155930 has 16 divisors (see below), whose sum is σ = 36332064. Its totient is φ = 8050960.

The previous prime is 20155913. The next prime is 20155951. The reversal of 20155930 is 3955102.

It is a junction number, because it is equal to n+sod(n) for n = 20155895 and 20155904.

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, 12045 + ... + 13615.

It is an arithmetic number, because the mean of its divisors is an integer number (2270754).

Almost surely, 2^20155930 is an apocalyptic number.

20155930 is a deficient number, since it is larger than the sum of its proper divisors (16176134).

20155930 is a wasteful number, since it uses less digits than its factorization.

20155930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2861.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20155930 is about 4489.5356107286. The cubic root of 20155930 is about 272.1453681575.

The spelling of 20155930 in words is "twenty million, one hundred fifty-five thousand, nine hundred thirty".