20867457 has 16 divisors (see below), whose sum is σ = 30058560. Its totient is φ = 12800832.

The previous prime is 20867447. The next prime is 20867471. The reversal of 20867457 is 75476802.

It is not a de Polignac number, because 20867457 - 2¹² = 20863361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20867437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15703 + ... + 16979.

It is an arithmetic number, because the mean of its divisors is an integer number (1878660).

Almost surely, 2^20867457 is an apocalyptic number.

It is an amenable number.

20867457 is a deficient number, since it is larger than the sum of its proper divisors (9191103).

20867457 is a wasteful number, since it uses less digits than its factorization.

20867457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 20867457 is about 4568.0911768484. The cubic root of 20867457 is about 275.3107539455.

The spelling of 20867457 in words is "twenty million, eight hundred sixty-seven thousand, four hundred fifty-seven".