20749212 has 72 divisors (see below), whose sum is σ = 57762432. Its totient is φ = 6228000.

The previous prime is 20749187. The next prime is 20749213. The reversal of 20749212 is 21294702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20749213) 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, 59623 + ... + 59969.

It is an arithmetic number, because the mean of its divisors is an integer number (802256).

Almost surely, 2^20749212 is an apocalyptic number.

20749212 is a gapful number since it is divisible by the number (22) 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 20749212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28881216).

20749212 is an abundant number, since it is smaller than the sum of its proper divisors (37013220).

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

20749212 is a wasteful number, since it uses less digits than its factorization.

20749212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20749212 is about 4555.1302945141. The cubic root of 20749212 is about 274.7897544536.

Subtracting 20749212 from its reverse (21294702), we obtain a triangular number (545490 = T₁₀₄₄).

The spelling of 20749212 in words is "twenty million, seven hundred forty-nine thousand, two hundred twelve".