20953878 has 16 divisors (see below), whose sum is σ = 45717696. Its totient is φ = 6349640.

The previous prime is 20953873. The next prime is 20953879. The reversal of 20953878 is 87835902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20953871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158676 + ... + 158807.

It is an arithmetic number, because the mean of its divisors is an integer number (2857356).

Almost surely, 2^20953878 is an apocalyptic number.

20953878 is an abundant number, since it is smaller than the sum of its proper divisors (24763818).

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

20953878 is a wasteful number, since it uses less digits than its factorization.

20953878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317499.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 20953878 is about 4577.5406060460. The cubic root of 20953878 is about 275.6902900640.

The spelling of 20953878 in words is "twenty million, nine hundred fifty-three thousand, eight hundred seventy-eight".