20954787 has 16 divisors (see below), whose sum is σ = 32017920. Its totient is φ = 11941632.

The previous prime is 20954779. The next prime is 20954807. The reversal of 20954787 is 78745902.

It is not a de Polignac number, because 20954787 - 2³ = 20954779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20954707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8083 + ... + 10355.

It is an arithmetic number, because the mean of its divisors is an integer number (2001120).

Almost surely, 2^20954787 is an apocalyptic number.

20954787 is a deficient number, since it is larger than the sum of its proper divisors (11063133).

20954787 is a wasteful number, since it uses less digits than its factorization.

20954787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 20954787 is about 4577.6398940939. The cubic root of 20954787 is about 275.6942765790.

The spelling of 20954787 in words is "twenty million, nine hundred fifty-four thousand, seven hundred eighty-seven".