20428577 has 16 divisors (see below), whose sum is σ = 24312960. Its totient is φ = 16972032.

The previous prime is 20428567. The next prime is 20428579. The reversal of 20428577 is 77582402.

It is a cyclic number.

It is not a de Polignac number, because 20428577 - 2¹⁴ = 20412193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20428579) 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, 3074 + ... + 7092.

It is an arithmetic number, because the mean of its divisors is an integer number (1519560).

Almost surely, 2^20428577 is an apocalyptic number.

It is an amenable number.

20428577 is a deficient number, since it is larger than the sum of its proper divisors (3884383).

20428577 is a wasteful number, since it uses less digits than its factorization.

20428577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072.

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 20428577 is about 4519.7983362093. The cubic root of 20428577 is about 273.3669697187.

The spelling of 20428577 in words is "twenty million, four hundred twenty-eight thousand, five hundred seventy-seven".