20748437 has 4 divisors (see below), whose sum is σ = 21840480. Its totient is φ = 19656396.

The previous prime is 20748421. The next prime is 20748443. The reversal of 20748437 is 73484702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20748437 - 2⁴ = 20748421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20748397 and 20748406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20748467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545993 + ... + 546030.

It is an arithmetic number, because the mean of its divisors is an integer number (5460120).

Almost surely, 2^20748437 is an apocalyptic number.

It is an amenable number.

20748437 is a deficient number, since it is larger than the sum of its proper divisors (1092043).

20748437 is a wasteful number, since it uses less digits than its factorization.

20748437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092042.

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 20748437 is about 4555.0452248029. The cubic root of 20748437 is about 274.7863332038.

The spelling of 20748437 in words is "twenty million, seven hundred forty-eight thousand, four hundred thirty-seven".