20429563 has 16 divisors (see below), whose sum is σ = 26970624. Its totient is φ = 14981760.

The previous prime is 20429557. The next prime is 20429569. The reversal of 20429563 is 36592402.

It is an interprime number because it is at equal distance from previous prime (20429557) and next prime (20429569).

It is not a de Polignac number, because 20429563 - 2⁵ = 20429531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20429569) 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, 6495 + ... + 9112.

It is an arithmetic number, because the mean of its divisors is an integer number (1685664).

Almost surely, 2^20429563 is an apocalyptic number.

20429563 is a deficient number, since it is larger than the sum of its proper divisors (6541061).

20429563 is a wasteful number, since it uses less digits than its factorization.

20429563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15642.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 20429563 is about 4519.9074105561. The cubic root of 20429563 is about 273.3713677326.

The spelling of 20429563 in words is "twenty million, four hundred twenty-nine thousand, five hundred sixty-three".