20899154 has 24 divisors (see below), whose sum is σ = 34190100. Its totient is φ = 9547776.

The previous prime is 20899129. The next prime is 20899159. The reversal of 20899154 is 45199802.

It can be written as a sum of positive squares in 6 ways, for example, as 20566225 + 332929 = 4535^2 + 577^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20899159) 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, 46322 + ... + 46770.

Almost surely, 2^20899154 is an apocalyptic number.

20899154 is a deficient number, since it is larger than the sum of its proper divisors (13290946).

20899154 is a wasteful number, since it uses less digits than its factorization.

20899154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 20899154 is about 4571.5592525964. The cubic root of 20899154 is about 275.4500795032.

The spelling of 20899154 in words is "twenty million, eight hundred ninety-nine thousand, one hundred fifty-four".