20937492 has 18 divisors (see below), whose sum is σ = 52925418. Its totient is φ = 6979152.

The previous prime is 20937481. The next prime is 20937503. The reversal of 20937492 is 29473902.

It is an interprime number because it is at equal distance from previous prime (20937481) and next prime (20937503).

It can be written as a sum of positive squares in only one way, i.e., 12152196 + 8785296 = 3486^2 + 2964^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 581597 = 20937492 / (2 + 0 + 9 + 3 + 7 + 4 + 9 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 290763 + ... + 290834.

It is an arithmetic number, because the mean of its divisors is an integer number (2940301).

Almost surely, 2^20937492 is an apocalyptic number.

It is an amenable number.

20937492 is an abundant number, since it is smaller than the sum of its proper divisors (31987926).

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

20937492 is a wasteful number, since it uses less digits than its factorization.

20937492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581607 (or 581602 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20937492 is about 4575.7504302573. The cubic root of 20937492 is about 275.6184077588.

The spelling of 20937492 in words is "twenty million, nine hundred thirty-seven thousand, four hundred ninety-two".