20829972 has 12 divisors (see below), whose sum is σ = 48603296. Its totient is φ = 6943320.

The previous prime is 20829971. The next prime is 20829979. The reversal of 20829972 is 27992802.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20829972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20829971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 867904 + ... + 867927.

Almost surely, 2^20829972 is an apocalyptic number.

It is an amenable number.

20829972 is an abundant number, since it is smaller than the sum of its proper divisors (27773324).

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

20829972 is a wasteful number, since it uses less digits than its factorization.

20829972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735838 (or 1735836 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20829972 is about 4563.9864154048. The cubic root of 20829972 is about 275.1458047744.

The spelling of 20829972 in words is "twenty million, eight hundred twenty-nine thousand, nine hundred seventy-two".