20952500 has 90 divisors (see below), whose sum is σ = 50351070. Its totient is φ = 7616000.

The previous prime is 20952479. The next prime is 20952521. The reversal of 20952500 is 525902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20952479) and next prime (20952521).

It can be written as a sum of positive squares in 15 ways, for example, as 17522596 + 3429904 = 4186^2 + 1852^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 722486 + ... + 722514.

Almost surely, 2^20952500 is an apocalyptic number.

20952500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20952500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25175535).

20952500 is an abundant number, since it is smaller than the sum of its proper divisors (29398570).

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

20952500 is a wasteful number, since it uses less digits than its factorization.

20952500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 20952500 is about 4577.3900860643. The cubic root of 20952500 is about 275.6842464803.

The spelling of 20952500 in words is "twenty million, nine hundred fifty-two thousand, five hundred".