20899942 has 16 divisors (see below), whose sum is σ = 36417312. Its totient is φ = 8809920.

The previous prime is 20899933. The next prime is 20899951. The reversal of 20899942 is 24999802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20899933) and next prime (20899951).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11383 + ... + 13090.

It is an arithmetic number, because the mean of its divisors is an integer number (2276082).

Almost surely, 2^20899942 is an apocalyptic number.

20899942 is a deficient number, since it is larger than the sum of its proper divisors (15517370).

20899942 is a wasteful number, since it uses less digits than its factorization.

20899942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24543.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 20899942 is about 4571.6454368203. The cubic root of 20899942 is about 275.4535413967.

The spelling of 20899942 in words is "twenty million, eight hundred ninety-nine thousand, nine hundred forty-two".