20917954 has 8 divisors (see below), whose sum is σ = 32142348. Its totient is φ = 10203840.

The previous prime is 20917951. The next prime is 20917969. The reversal of 20917954 is 45971902.

It can be written as a sum of positive squares in 2 ways, for example, as 20912329 + 5625 = 4573^2 + 75^2 .

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

It is a super-2 number, since 2×20917954² = 875121599092232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20917951) 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, 127467 + ... + 127630.

Almost surely, 2^20917954 is an apocalyptic number.

20917954 is a deficient number, since it is larger than the sum of its proper divisors (11224394).

20917954 is a wasteful number, since it uses less digits than its factorization.

20917954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255140.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 20917954 is about 4573.6149816092. The cubic root of 20917954 is about 275.5326491851.

The spelling of 20917954 in words is "twenty million, nine hundred seventeen thousand, nine hundred fifty-four".