20900024 has 8 divisors (see below), whose sum is σ = 39187560. Its totient is φ = 10450008.

The previous prime is 20899993. The next prime is 20900051. The reversal of 20900024 is 42000902.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20900024² = 873622006401152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20899975 and 20900011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1306244 + ... + 1306259.

It is an arithmetic number, because the mean of its divisors is an integer number (4898445).

Almost surely, 2^20900024 is an apocalyptic number.

It is an amenable number.

20900024 is a deficient number, since it is larger than the sum of its proper divisors (18287536).

20900024 is a wasteful number, since it uses less digits than its factorization.

20900024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612509 (or 2612505 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20900024 is about 4571.6544051361. The cubic root of 20900024 is about 275.4539016395.

Adding to 20900024 its reverse (42000902), we get a palindrome (62900926).

The spelling of 20900024 in words is "twenty million, nine hundred thousand, twenty-four".