20951404 has 6 divisors (see below), whose sum is σ = 36664964. Its totient is φ = 10475700.

The previous prime is 20951387. The next prime is 20951407. The reversal of 20951404 is 40415902.

It is a super-2 number, since 2×20951404² = 877922659142432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20951407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2618922 + ... + 2618929.

Almost surely, 2^20951404 is an apocalyptic number.

It is an amenable number.

20951404 is a deficient number, since it is larger than the sum of its proper divisors (15713560).

20951404 is a wasteful number, since it uses less digits than its factorization.

20951404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5237855 (or 5237853 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20951404 is about 4577.2703656219. The cubic root of 20951404 is about 275.6794394930.

The spelling of 20951404 in words is "twenty million, nine hundred fifty-one thousand, four hundred four".