20901608 has 32 divisors (see below), whose sum is σ = 48236160. Its totient is φ = 8268480.

The previous prime is 20901607. The next prime is 20901631. The reversal of 20901608 is 80610902.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20901607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13628 + ... + 15083.

It is an arithmetic number, because the mean of its divisors is an integer number (1507380).

Almost surely, 2^20901608 is an apocalyptic number.

20901608 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20901608 is an abundant number, since it is smaller than the sum of its proper divisors (27334552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20901608 is a wasteful number, since it uses less digits than its factorization.

20901608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28737 (or 28733 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20901608 is about 4571.8276432954. The cubic root of 20901608 is about 275.4608602911.

The spelling of 20901608 in words is "twenty million, nine hundred one thousand, six hundred eight".