20972028 has 48 divisors (see below), whose sum is σ = 61012224. Its totient is φ = 5447040.

The previous prime is 20972023. The next prime is 20972041. The reversal of 20972028 is 82027902.

It is a junction number, because it is equal to n+sod(n) for n = 20971986 and 20972004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10425 + ... + 12272.

It is an arithmetic number, because the mean of its divisors is an integer number (1271088).

Almost surely, 2^20972028 is an apocalyptic number.

20972028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20972028 is an abundant number, since it is smaller than the sum of its proper divisors (40040196).

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

20972028 is a wasteful number, since it uses less digits than its factorization.

20972028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22722 (or 22720 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20972028 is about 4579.5226825511. The cubic root of 20972028 is about 275.7698669761.

The spelling of 20972028 in words is "twenty million, nine hundred seventy-two thousand, twenty-eight".