20951224 has 96 divisors (see below), whose sum is σ = 50274000. Its totient is φ = 8128512.

The previous prime is 20951209. The next prime is 20951233. The reversal of 20951224 is 42215902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 215944 + ... + 216040.

Almost surely, 2^20951224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20951224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25137000).

20951224 is an abundant number, since it is smaller than the sum of its proper divisors (29322776).

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

20951224 is a wasteful number, since it uses less digits than its factorization.

20951224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20951224 is about 4577.2507032060. The cubic root of 20951224 is about 275.6786500083.

The spelling of 20951224 in words is "twenty million, nine hundred fifty-one thousand, two hundred twenty-four".