20229657 has 16 divisors (see below), whose sum is σ = 30898560. Its totient is φ = 11532672.

The previous prime is 20229653. The next prime is 20229667. The reversal of 20229657 is 75692202.

It is a happy number.

It is not a de Polignac number, because 20229657 - 2² = 20229653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20229653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11103 + ... + 12795.

It is an arithmetic number, because the mean of its divisors is an integer number (1931160).

Almost surely, 2^20229657 is an apocalyptic number.

It is an amenable number.

20229657 is a deficient number, since it is larger than the sum of its proper divisors (10668903).

20229657 is a wasteful number, since it uses less digits than its factorization.

20229657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 20229657 is about 4497.7390987028. The cubic root of 20229657 is about 272.4767850492.

The spelling of 20229657 in words is "twenty million, two hundred twenty-nine thousand, six hundred fifty-seven".