20942487 has 12 divisors (see below), whose sum is σ = 32029920. Its totient is φ = 13140288.

The previous prime is 20942483. The next prime is 20942507. The reversal of 20942487 is 78424902.

It is not a de Polignac number, because 20942487 - 2² = 20942483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20942483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68287 + ... + 68592.

It is an arithmetic number, because the mean of its divisors is an integer number (2669160).

Almost surely, 2^20942487 is an apocalyptic number.

20942487 is a deficient number, since it is larger than the sum of its proper divisors (11087433).

20942487 is a wasteful number, since it uses less digits than its factorization.

20942487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136902 (or 136899 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20942487 is about 4576.2962098186. The cubic root of 20942487 is about 275.6403238584.

The spelling of 20942487 in words is "twenty million, nine hundred forty-two thousand, four hundred eighty-seven".