20857350 has 48 divisors (see below), whose sum is σ = 52050240. Its totient is φ = 5527200.

The previous prime is 20857321. The next prime is 20857357. The reversal of 20857350 is 5375802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857357) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31321 + ... + 31979.

It is an arithmetic number, because the mean of its divisors is an integer number (1084380).

Almost surely, 2^20857350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20857350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26025120).

20857350 is an abundant number, since it is smaller than the sum of its proper divisors (31192890).

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

20857350 is a wasteful number, since it uses less digits than its factorization.

20857350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20857350 is about 4566.9847821073. The cubic root of 20857350 is about 275.2662985182.

The spelling of 20857350 in words is "twenty million, eight hundred fifty-seven thousand, three hundred fifty".