20761245 has 32 divisors (see below), whose sum is σ = 38188800. Its totient is φ = 10688832.

The previous prime is 20761229. The next prime is 20761253. The reversal of 20761245 is 54216702.

20761245 is a `hidden beast` number, since 2 + 0 + 7 + 612 + 45 = 666.

It is not a de Polignac number, because 20761245 - 2⁴ = 20761229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1264 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (1193400).

Almost surely, 2^20761245 is an apocalyptic number.

It is an amenable number.

20761245 is a deficient number, since it is larger than the sum of its proper divisors (17427555).

20761245 is a wasteful number, since it uses less digits than its factorization.

20761245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346 (or 5340 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20761245 is about 4556.4509214958. The cubic root of 20761245 is about 274.8428633964.

Adding to 20761245 its reverse (54216702), we get a palindrome (74977947).

It can be divided in two parts, 2076 and 1245, that added together give a triangular number (3321 = T₈₁).

The spelling of 20761245 in words is "twenty million, seven hundred sixty-one thousand, two hundred forty-five".