20887942 has 8 divisors (see below), whose sum is σ = 32096232. Its totient is φ = 10189200.

The previous prime is 20887939. The next prime is 20887949. The reversal of 20887942 is 24978802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20887942² = 872612241990728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20887895 and 20887904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127284 + ... + 127447.

It is an arithmetic number, because the mean of its divisors is an integer number (4012029).

Almost surely, 2^20887942 is an apocalyptic number.

20887942 is a deficient number, since it is larger than the sum of its proper divisors (11208290).

20887942 is a wasteful number, since it uses less digits than its factorization.

20887942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254774.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 20887942 is about 4570.3328106386. The cubic root of 20887942 is about 275.4008127763.

The spelling of 20887942 in words is "twenty million, eight hundred eighty-seven thousand, nine hundred forty-two".