20929228 has 12 divisors (see below), whose sum is σ = 36811600. Its totient is φ = 10411632.

The previous prime is 20929177. The next prime is 20929253. The reversal of 20929228 is 82292902.

It is a junction number, because it is equal to n+sod(n) for n = 20929193 and 20929202.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12351 + ... + 13942.

Almost surely, 2^20929228 is an apocalyptic number.

It is an amenable number.

20929228 is a deficient number, since it is larger than the sum of its proper divisors (15882372).

20929228 is a wasteful number, since it uses less digits than its factorization.

20929228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26496 (or 26494 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 20929228 is about 4574.8473198567. The cubic root of 20929228 is about 275.5821409150.

It can be divided in two parts, 209292 and 28, that multiplied together give a triangular number (5860176 = T₃₄₂₃).

The spelling of 20929228 in words is "twenty million, nine hundred twenty-nine thousand, two hundred twenty-eight".