20748740 has 12 divisors (see below), whose sum is σ = 43572396. Its totient is φ = 8299488.

The previous prime is 20748727. The next prime is 20748751. The reversal of 20748740 is 4784702.

It can be written as a sum of positive squares in 2 ways, for example, as 11397376 + 9351364 = 3376^2 + 3058^2 .

It is a super-3 number, since 3×20748740³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20748697 and 20748706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518699 + ... + 518738.

It is an arithmetic number, because the mean of its divisors is an integer number (3631033).

Almost surely, 2^20748740 is an apocalyptic number.

20748740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20748740 is an abundant number, since it is smaller than the sum of its proper divisors (22823656).

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

20748740 is a wasteful number, since it uses less digits than its factorization.

20748740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037446 (or 1037444 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 20748740 is about 4555.0784845050. The cubic root of 20748740 is about 274.7876708123.

The spelling of 20748740 in words is "twenty million, seven hundred forty-eight thousand, seven hundred forty".