20825720 has 32 divisors (see below), whose sum is σ = 47524320. Its totient is φ = 8211840.

The previous prime is 20825713. The next prime is 20825723. The reversal of 20825720 is 2752802.

It is a super-2 number, since 2×20825720² = 867421227036800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20825720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20825723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (1485135).

Almost surely, 2^20825720 is an apocalyptic number.

20825720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20825720 is an abundant number, since it is smaller than the sum of its proper divisors (26698600).

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

20825720 is a wasteful number, since it uses less digits than its factorization.

20825720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7415 (or 7411 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 20825720 is about 4563.5205707874. The cubic root of 20825720 is about 275.1270817604.

The spelling of 20825720 in words is "twenty million, eight hundred twenty-five thousand, seven hundred twenty".