20829620 has 24 divisors (see below), whose sum is σ = 49991424. Its totient is φ = 7141536.

The previous prime is 20829581. The next prime is 20829637. The reversal of 20829620 is 2692802.

It is a happy number.

It is a congruent number.

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, 74252 + ... + 74531.

It is an arithmetic number, because the mean of its divisors is an integer number (2082976).

Almost surely, 2^20829620 is an apocalyptic number.

20829620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20829620 is an abundant number, since it is smaller than the sum of its proper divisors (29161804).

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

20829620 is a wasteful number, since it uses less digits than its factorization.

20829620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148799 (or 148797 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20829620 is about 4563.9478524628. The cubic root of 20829620 is about 275.1442548945.

The spelling of 20829620 in words is "twenty million, eight hundred twenty-nine thousand, six hundred twenty".