20847372 has 96 divisors (see below), whose sum is σ = 63447552. Its totient is φ = 5170176.

The previous prime is 20847371. The next prime is 20847377. The reversal of 20847372 is 27374802.

It is a super-2 number, since 2×20847372² = 869225838612768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (20847371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18003 + ... + 19125.

It is an arithmetic number, because the mean of its divisors is an integer number (660912).

Almost surely, 2^20847372 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 20847372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31723776).

20847372 is an abundant number, since it is smaller than the sum of its proper divisors (42600180).

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

20847372 is a wasteful number, since it uses less digits than its factorization.

20847372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 20847372 is about 4565.8922457719. The cubic root of 20847372 is about 275.2223964049. Note that the first 3 decimals are identical.

The spelling of 20847372 in words is "twenty million, eight hundred forty-seven thousand, three hundred seventy-two".