20951406469 has 4 divisors (see below), whose sum is σ = 23944464544. Its totient is φ = 17958348396.

The previous prime is 20951406409. The next prime is 20951406517. The reversal of 20951406469 is 96460415902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20951406469 - 2²⁷ = 20817188741 is a prime.

It is a super-2 number, since 2×20951406469² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20951406409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1496529027 + ... + 1496529040.

It is an arithmetic number, because the mean of its divisors is an integer number (5986116136).

Almost surely, 2^20951406469 is an apocalyptic number.

It is an amenable number.

20951406469 is a deficient number, since it is larger than the sum of its proper divisors (2993058075).

20951406469 is an equidigital number, since it uses as much as digits as its factorization.

20951406469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993058074.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 20951406469 in words is "twenty billion, nine hundred fifty-one million, four hundred six thousand, four hundred sixty-nine".