20951886 has 8 divisors (see below), whose sum is σ = 41903784. Its totient is φ = 6983960.

The previous prime is 20951881. The next prime is 20951899. The reversal of 20951886 is 68815902.

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

20951886 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20951881) 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, 1745985 + ... + 1745996.

It is an arithmetic number, because the mean of its divisors is an integer number (5237973).

Almost surely, 2^20951886 is an apocalyptic number.

20951886 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20951886 is a wasteful number, since it uses less digits than its factorization.

20951886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491986.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 20951886 is about 4577.3230167861. The cubic root of 20951886 is about 275.6815535354.

The spelling of 20951886 in words is "twenty million, nine hundred fifty-one thousand, eight hundred eighty-six".