20913850 has 24 divisors (see below), whose sum is σ = 39543228. Its totient is φ = 8227200.

The previous prime is 20913839. The next prime is 20913857. The reversal of 20913850 is 5831902.

20913850 = T₂₈₆ + T₂₈₇ + ... + T₅₂₉.

It can be written as a sum of positive squares in 6 ways, for example, as 1521 + 20912329 = 39^2 + 4573^2 .

It is not an unprimeable number, because it can be changed into a prime (20913857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 379 + ... + 6478.

Almost surely, 2^20913850 is an apocalyptic number.

20913850 is a deficient number, since it is larger than the sum of its proper divisors (18629378).

20913850 is a wasteful number, since it uses less digits than its factorization.

20913850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6930 (or 6925 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20913850 is about 4573.1662991848. The cubic root of 20913850 is about 275.5146286217.

The spelling of 20913850 in words is "twenty million, nine hundred thirteen thousand, eight hundred fifty".