20429961 has 8 divisors (see below), whose sum is σ = 28118784. Its totient is φ = 13180560.

The previous prime is 20429923. The next prime is 20429987. The reversal of 20429961 is 16992402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20429961 - 2¹⁰ = 20428937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20469961) 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, 109746 + ... + 109931.

It is an arithmetic number, because the mean of its divisors is an integer number (3514848).

Almost surely, 2^20429961 is an apocalyptic number.

It is an amenable number.

20429961 is a deficient number, since it is larger than the sum of its proper divisors (7688823).

20429961 is a wasteful number, since it uses less digits than its factorization.

20429961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219711.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20429961 is about 4519.9514377922. The cubic root of 20429961 is about 273.3731429557.

The spelling of 20429961 in words is "twenty million, four hundred twenty-nine thousand, nine hundred sixty-one".