20902761 has 24 divisors (see below), whose sum is σ = 33134400. Its totient is φ = 12592800.

The previous prime is 20902757. The next prime is 20902769. The reversal of 20902761 is 16720902.

It is not a de Polignac number, because 20902761 - 2² = 20902757 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20902769) 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, 19171 + ... + 20231.

It is an arithmetic number, because the mean of its divisors is an integer number (1380600).

Almost surely, 2^20902761 is an apocalyptic number.

It is an amenable number.

20902761 is a deficient number, since it is larger than the sum of its proper divisors (12231639).

20902761 is a wasteful number, since it uses less digits than its factorization.

20902761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277 (or 1274 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20902761 is about 4571.9537399234. The cubic root of 20902761 is about 275.4659253007.

It can be divided in two parts, 2090 and 2761, that added together give a triangular number (4851 = T₉₈).

The spelling of 20902761 in words is "twenty million, nine hundred two thousand, seven hundred sixty-one".